Cycles - Cycle trailers - Safety requirements and test methods

This European standard specifies safety requirements and test methods for two track cycle trailers (i.e. with one or two wheels) and their connecting devices.
These cycle trailers are intended for the conveyance of cargo loads or up to two passive child passengers (i.e. not pedalling), both of whom are capable of sitting unaided and neither of whom weighs more than 22 kg.
The maximum permitted weight of such a cycle trailer, including cargo and/or passenger(s), does not exceed 60 kg.
This standard is not applicable to trailer cycles (one or two-track trailer for the transportation of one or two pedalling passengers, usually children, with device for connection behind cycle) and for type L trailers for professional use or with a single wheel (single track trailer) according to Table 1.

Fahrräder - Fahrradanhänger - Sicherheitstechnische Anforderungen und Prüfverfahren

Diese Europäische Norm legt sicherheitstechnische Anforderungen und die entsprechenden Prüfver¬fahren für zweispurige Fahrradanhänger (das heißt mit einem oder zwei Rädern) und deren Verbin-dungseinrichtungen fest.
Diese Fahrradanhänger sind für die Beförderung von Nutzlasten oder von bis zu zwei Kindern als passiv beförderte Personen bestimmt (das heißt nicht tretend), von denen beide ohne fremde Hilfe sitzen können und keines mehr als 22 kg wiegt.
Das zulässige Höchstgewicht eines solchen Fahrradanhängers, einschließlich der Last und/oder der be-förderten Person(en), liegt bei 60 kg.
Diese Norm gilt nicht für Anhängerfahrräder (ein  oder zweispuriger Fahrradanhänger für die Beför-derung von ein oder zwei tretenden Personen, üblicherweise Kinder, mit einer Vorrichtung zur An-bringung hinter einem Fahrrad) und für Typ L Anhänger für den beruflichen Gebrauch oder mit einem einzelnen Rad (einrädriger Anhänger) entsprechend Tabelle 1.

Cycles - Remorques pour cycles - Exigences de sécurité et méthodes d'essai

La présente Norme européenne spécifie des exigences de sécurité et des méthodes d'essai pour les remorques pour cycle à deux voies (c'est-à-dire à une ou deux roues) et leurs dispositifs d'attelage.
Ces remorques pour cycle sont destinées au transport de charges ou jusqu'à deux enfants passifs (ne pédalant pas) capables de se tenir assis sans aide dont aucun ne pèse plus de 22 kg.
La masse maximale autorisée d'une telle remorque pour cycle, charge et/ou passager(s) compris, ne dépasse pas 60 kg.
La présente norme n'est pas applicable aux vélos remorqués (remorque à une ou deux voies avec dispositif d'attelage derrière un cycle pour le transport d'un ou deux passagers pédalant, habituellement des enfants) ni aux remorques de type L pour usage professionnel ou à une seule roue (remorque à une seule voie) conformément au Tableau 1.

Kolesa - Prikolice za kolesa - Varnostne zahteve in preskusne metode

Ta evropski standard določa varnostne zahteve in preskusne metode za dvotirne prikolice za kolesa (tj. z enim ali dvema kolesoma) in njihove priključke.
Te prikolice za kolesa so namenjene prenosu tovornih bremen ali do dveh pasivnih otrok (to pomeni, da ne poganjata pedalov), ki sta zmožna sedeti brez pomoči in katerih teža ne presega 22 kg na osebo.
Največja dovoljena teža takšne prikolice za kolo, vključno s tovorom in/ali osebami, ne sme presegati 60 kg.
Ta standard se ne uporablja za priklopnike za kolesa (eno- ali dvotirna prikolica za prevoz ene ali dveh oseb, ki poganjata pedale, običajno otrok, z napravo za povezavo za kolesom) in za prikolice vrste L za profesionalno uporabo ali z enim samim kolesom (enotirna prikolica) v skladu s preglednico 1.

General Information

Status
Published
Publication Date
07-Mar-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
08-Mar-2017
Completion Date
08-Mar-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kolesa - Prikolice za kolesa - Varnostne zahteve in preskusne metodeFahrräder - Fahrradanhänger - Sicherheitstechnische Anforderungen und PrüfverfahrenCycles - Remorques pour cycles - Exigences de sécurité et méthodes d'essaiCycles - Cycle trailers - Safety requirements and test methods43.150KolesaCyclesICS:Ta slovenski standard je istoveten z:EN 15918:2011+A2:2017SIST EN 15918:2011+A2:2017en,fr,de01-maj-2017SIST EN 15918:2011+A2:2017SLOVENSKI

STANDARDSIST EN 15918:2011+A1:20131DGRPHãþD
SIST EN 15918:2011+A2:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15918:2011+A2
March 2017 ICS 43.150 Supersedes EN 15918:2011+A1:2013
English Version
Cycles - Cycle trailers - Safety requirements and test methods
Cycles - Remorques pour cycles - Exigences de sécurité et méthodes d'essai

Fahrräder - Fahrradanhänger - Sicherheitstechnische Anforderungen und Prüfverfahren This European Standard was approved by CEN on 18 June 2011 and includes Amendment 1 approved by CEN on 20 November 2012 and Amendment 2 approved by CEN on 6 February 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15918:2011+A2:2017 E SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 Introduction .................................................................................................................................................................... 5 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 3 Terms and definitions ................................................................................................................................... 6 4 General test requirements ........................................................................................................................... 7 4.1 Classification of cycle trailers ..................................................................................................................... 7 4.2 Sampling ............................................................................................................................................................. 8 4.3 Order of tests .................................................................................................................................................... 8 4.4 Tolerances ......................................................................................................................................................... 8 4.5 Test bodies ......................................................................................................................................................... 9 4.6 Access zone for type C cycle trailers ......................................................................................................... 9 5 Materials ............................................................................................................................................................. 9 5.1 Chemical properties for type C cycle trailers (Migration of certain elements) ........................ 9 5.2 Flammability for type C cycle trailers ...................................................................................................... 9 6 Construction ................................................................................................................................................... 10 6.1 General ............................................................................................................................................................. 10 6.2 Drawbar load and height ........................................................................................................................... 10 6.3 Deflection device .......................................................................................................................................... 10 6.4 Hazardous edges and protrusions ......................................................................................................... 11 6.4.1 Requirements ................................................................................................................................................ 11 6.4.2 Test methods ................................................................................................................................................. 11 6.5 Shear and compression points for type C cycle trailers ................................................................. 11 6.6 Indirect contact with the wheels for type C cycle trailers ............................................................. 11 6.6.1 Requirements ................................................................................................................................................ 11 6.6.2 Test methods ................................................................................................................................................. 11 6.7 Front protection for type C cycle trailers ............................................................................................ 12 6.7.1 Requirements ................................................................................................................................................ 12 6.7.2 Test methods ................................................................................................................................................. 12 6.8 Entrapment for type C cycle trailers ..................................................................................................... 12 6.8.1 Requirements ................................................................................................................................................ 12 6.8.2 Test methods ................................................................................................................................................. 12 6.9 Small parts for type C cycle trailers ....................................................................................................... 13 6.10 Folding mechanism ..................................................................................................................................... 14 6.10.1 Requirements ................................................................................................................................................ 14 6.10.2 Test method ................................................................................................................................................... 14 6.11 Dimensions of the headroom for type C cycle trailers .................................................................... 14 6.11.1 Requirements ................................................................................................................................................ 14 6.11.2 Test method ................................................................................................................................................... 14 6.12 Parking brake ................................................................................................................................................ 15 6.12.1 Requirements ................................................................................................................................................ 15 6.12.2 Test method ................................................................................................................................................... 16 6.13 Stability ............................................................................................................................................................ 16 6.13.1 Requirements ................................................................................................................................................ 16 SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 3 6.13.2 Stability test for type C2 cycle trailers .................................................................................................. 16 6.14 Lighting systems, reflectors and other conspicuity aids ................................................................ 16 6.15 Frame and chassis ........................................................................................................................................ 17 6.15.1 Requirements ................................................................................................................................................. 17 6.15.2 Test method .................................................................................................................................................... 17 6.16 Drawbar and connecting device .............................................................................................................. 19 6.16.1 Requirements ................................................................................................................................................. 19 6.16.2 Test method .................................................................................................................................................... 20 6.17 Secondary safety device ............................................................................................................................. 20 6.17.1 Requirements ................................................................................................................................................. 21 6.17.2 Test method .................................................................................................................................................... 21 6.18 Strength of the restraint system .............................................................................................................. 21 6.18.1 Requirements ................................................................................................................................................. 21 6.18.2 Test method .................................................................................................................................................... 21 6.19 Rigidity of the passenger cab for type C cycle trailers only ........................................................... 22 6.19.1 Requirements ................................................................................................................................................. 22 6.19.2 Test method .................................................................................................................................................... 22 7 Test report ...................................................................................................................................................... 23 8 Manufacturer's instructions ..................................................................................................................... 23 9 Marking ............................................................................................................................................................ 24 9.1 Marking requirement .................................................................................................................................. 24 9.2 Durability......................................................................................................................................................... 24 Annex A (normative)

Test bodies .......................................................................................................................... 25 Annex B (normative)

Calculation of maximum possible deceleration ..................................................... 28 Annex C (normative)

Test order ............................................................................................................................. 31 C.1 General ............................................................................................................................................................. 31 C.2 Dynamic tests ................................................................................................................................................. 31 C.3 Static tests ....................................................................................................................................................... 31 Bibliography ................................................................................................................................................................. 32 SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 4 European foreword This document (EN 15918:2011+A2:2017) has been prepared by Technical Committee CEN/TC 333 “Cycles”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2017, and conflicting national standards shall be withdrawn at the latest by September 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1 approved by CEN on 20 November 2012 and Amendment 2, approved by CEN on 6 February 2017. This document supersedes #EN 15918:2011+A1:2013$. The start and finish of text introduced or altered by amendment is indicated in the text by tags !" and #$. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 5 Introduction This European Standard does not cover single wheel trailers due to the time necessary for test method validation, even though this type is a significant share of the market. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 6 1 Scope This European standard specifies safety requirements and test methods for two track cycle trailers (i.e. with one or two wheels) and their connecting devices. These cycle trailers are intended for the conveyance of cargo loads or up to two passive child passengers (i.e. not pedalling), both of whom are capable of sitting unaided and neither of whom weighs more than 22 kg. The maximum permitted weight of such a cycle trailer, including cargo and/or passenger(s), does not exceed 60 kg. This standard is not applicable to trailer cycles (one or two-track trailer for the transportation of one or two pedalling passengers, usually children, with device for connection behind cycle) and for type L trailers for professional use or with a single wheel (single track trailer) according to Table 1. 2 Normative references !The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies." EN 71-1:2005+A9:2009, Safety of toys — Part 1: Mechanical and physical properties EN 71-3, Safety of toys — Part 3: Migration of certain elements EN 1888, Child care articles - Wheeled child conveyances - Safety requirements and test methods !EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025)" 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 cycle vehicle that has at least two wheels and is propelled solely or mainly by the muscular energy of the person on that vehicle, in particular by means of pedals 3.2 cycle trailer one or two track trailer for the conveyance of loads and/or passive passengers, who do not contribute towards propulsion of the vehicle, with device for connection behind a cycle Note 1 to entry: Classification, see 4.1. 3.3 parking brake device to maintain the vehicle in a stationary position 3.4 access zone part of a type C cycle trailer that can be touched by an occupant SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 7 3.5 connecting device part of the cycle trailer that is fixed to the towing bicycle !3.6 pitch pivot transverse horizontal axis of rotation between connecting device and trailer, which allows the vertical displacements of the trailer relative to the cycle that occur at changes in gradient of the road surface" !3.7" total weight weight of the cycle trailer plus load and/or children !3.8" nominal load either the maximum weight of children and/or cargo specified by the manufacturer or the difference between the total weight indicated by the manufacturer and the empty weight of the cycle trailer whichever is the greater !3.9" standard drawbar load vertical load measured at the pitch pivot of the connection to the bicycle, which results when the cycle trailer has been loaded up as intended with the nominal load !3.10" largest applicable test body largest of the three available standard sizes of test body (D9, D18 or D22) that is equal to or greater than the passenger height or weight limit specified by the manufacturer !3.11" visible crack crack which results from a test where that crack is visible to the naked eye !3.12" fracture unintentional separation into two or more parts !3.13" surface flash rapid spread of flame over the surface of a material without ignition of its base structure, reaching the first marker thread, which may or may not be severed, or either vertical edge of the test specimen [EN 1103:2005] 4 General test requirements 4.1 Classification of cycle trailers The classification of cycle trailers is given in Table 1. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 8 Table 1 — Types of cycle trailers Number of tracks For the transportation of: Childrena (C) Other loads (L) 1 (single track) — — 2 (two tracks) C2b L2 a In case the cycle trailer is convertible into e.g. a stroller, see EN 1888. b EXAMPLE

Type C2 is a two track cycle trailer for the transportation of children and luggage. 4.2 Sampling A single trailer shall be subjected to all of the following tests. For all cycle trailers, where the superstructures have a variable design, all combinations of equipment shall meet all relevant requirements. Accessories shall, if included by the manufacturer, be included in the tests. In cases where the test method allows an element of discretion on the part of the tester, the tester shall use his discretion to produce a situation which he considers most likely to result in a failure. 4.3 Order of tests The tests shall be performed in the following order: a) inspection test; b) dynamic test; c) static test. For the order of tests, see Annex C. 4.4 Tolerances Unless stated otherwise, the tolerances given in Table 2 shall apply to nominal values. Table 2 — Tolerances

Tolerances Forces and torques 0 / + 5 % Masses and weights ± 1 % Dimensions ± 1 mm Angles ± 1° Time duration ± 5 s Temperatures #± 5 °C$ Pressures ± 5 % Speeds ± 5 % Accelerations ± 5 % SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 9 4.5 Test bodies The test bodies shall be designed as shown in Annex A. 4.6 Access zone for type C cycle trailers Fix the largest applicable test body in the cycle trailer seat. Remove all removable parts of the cycle trailer cover. Use the test arm and test leg fixed at the shoulder and at the thigh of the test body and determine which parts of the cycle trailer can be touched (see Figure 1). For the dimensions of the test arms and test legs, see Table A.1. No two parts of a test limb shall be bent more acutely than 90°. No part of the test leg shall pass behind a vertical plane through points B. Use all available seating positions.

Figure 1 — Determining the extent of the access zone 5 Materials 5.1 Chemical properties for type C cycle trailers (Migration of certain elements) All parts and components in the access zone (see 4.6) shall comply with the requirements in EN 71-3. NOTE Attention is drawn to all legal requirements concerning Dangerous Substances e.g. Regulation (EC) No 1907/2006, etc. This requirement does not apply to parts or components which due to their accessibility, function, mass, size or other characteristics, obviously exclude any hazard due to sucking, licking or swallowing, bearing in mind the foreseeable behaviour of children. 5.2 Flammability for type C cycle trailers Fabrics shall not produce a surface flash. Materials with a surface which produce surface flash on the approach of a flame shall not be used. Surfaces showing no momentary area of flame in the area of the surface remote from the test flame are considered to meet this requirement. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 10 The test of the flammability shall be according to EN 1888. 6 Construction 6.1 General All tests shall be carried out at an ambient temperature of 23 °C. 6.2 Drawbar load and height The height of the pitch pivot between connecting device and the trailer shall not exceed 400 mm above a road surface and the range of standard drawbar loads shall be defined by manufacturer. The drawbar load shall not be negative. If the height of the connecting device is more than 400 mm above the road surface, it shall be verified that it is possible to decelerate the bicycle and trailer combination at not less than 0,35 g according to the calculation in Annex B. Cycle trailers with a total weight not exceeding 30 kg are exempted from this requirement. NOTE When the user connects the fully loaded trailer to any suitable cycle, it should not tend to lift the front wheel of the unloaded bicycle. 6.3 Deflection device Cycle trailers shall be designed such that a vertical obstacle cannot be caught between a wheel and the body of the cycle trailer when the cycle trailer is drawn forwards past any such obstacle. An example is shown in Figure 2. #

$ Key 1 deflection devices 2
vertical obstacle 3

moving direction Figure 2 — Example of the deflection devices #The width of cycle trailer in front of the wheels shall not be less than the distance between the tyre centrelines and be shaped so that the cycle trailer is deflected sideways when drawn past a vertical obstacle with a minimum height of 750 mm and diameter of 90 mm (see Figure 2).$ SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 11 6.4 Hazardous edges and protrusions 6.4.1 Requirements All accessible edges and protrusions of the cycle trailer under all conditions shall be rounded or chamfered and free from burrs. All surfaces of the cycle trailer shall be free from burrs and sharp edges. 6.4.2 Test methods All hazardous edges and protrusions shall be tested by visual and tactile inspection. 6.5 Shear and compression points for type C cycle trailers The roadway and any parts of the trailer which move or rotate relative to it when the trailer is in motion, shall not be within the access zone. Nether shall there be within the access zone, any shear or compression points between moving parts that can close to less than 12 mm, except if this motion occurs only when the trailer or a part of it is being erected, folded or adjusted (e.g. adjustment of the backrest). The edges and ends of any parts within the access zone (see 4.6) shall be rounded in accordance with 6.4, unless the clearance between the edge or end and an opposing surface is always less than 5 mm. The test method described in 4.6 shall be used to determine what is within the access zone. 6.6 Indirect contact with the wheels for type C cycle trailers 6.6.1 Requirements It shall not be possible for an occupant of a trailer to make a side panel touch a wheel. Use the test method described in 6.6.2. 6.6.2 Test methods Use the test probe shown in Figure 3 and apply a force of 80 N from the inside of the passenger area into the side panels. Apply the force for 1 min.

Key 1 Hemispherical end 2 Diameter of 60 mm Figure 3 — Hemispherical probes, diameter of 60 mm The probe shall have a diameter of 60 mm and a hemispherical end of radius 30 mm. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 12 6.7 Front protection for type C cycle trailers 6.7.1 Requirements The type C cycle trailers shall be equipped with a barrier against small projectiles from the front. If the barrier has holes to permit ventilation, the size of the holes shall be smaller than 4 mm. 6.7.2 Test methods Check the holes by using a probe of diameter (+0104, ) mm and a hemispherical end of 2 mm radius given in Figure 3 which shall have a weight of 100 g. Apply the force on 5 different places for 5 s each. An example of how to apply the probe is shown in Figure 4.

Figure 4 — Example for a mesh test 6.8 Entrapment for type C cycle trailers 6.8.1 Requirements There shall be no open ended tubes or apertures within the access zone of the vehicle (see 4.6) between 5 mm and 12 mm when measured in accordance with 6.8.2, unless the depth is less than 10 mm. 6.8.2 Test methods Check whether the 5 mm probe shown in Figure 5 when applied with a force of up to 30 N, enters 10 mm or more into the opening in any possible orientation. If the 5 mm probe enters 10 mm or more then the 12 mm probe (see Figure 5) shall also enter 10 mm or more with an applied force of up to 5 N. SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 13 Dimensions in millimetres

Key 1 Hemispherical end 2 Scribed line around circumference 3 Diameter 5 mm and 12 mm Figure 5 — Hemispherical probes, diameter of 5 mm and 12 mm 6.9 Small parts for type C cycle trailers In order to avoid ingestion or inhalation of small objects, detachable components within the access zone (see 4.6) shall not, without being compressed and whatever their orientation, fit entirely within the small parts cylinder shown in Figure 6. Dimensions in millimetres

Figure 6 — Small parts cylinder Non-detachable components within the access zone (see 4.6), i.e. those parts which are not intended to be removed, shall conform to one of the following: a) the components shall be so embedded that the child cannot grip them with its teeth or fingers; or SIST EN 15918:2011+A2:2017

EN 15918:2011+A2:2017 (E) 14 b) the components shall be so fixed to the product that they cannot become detached when the torque and tensile tests are carried out in accordance with EN 71-1:2005+A9:2009, paragraphs 4, 5, 6 and 7 of 8.4.2.1, using the apparatus according to EN 71-1:2005+A9:2009, 8.4.1.1 and 8.4.1.2; or c) any components which become detached during the tests referred to at b) above shall not, without being compressed and whatever their orientation, fit entirely within the small parts cylinder having dimensions as given in Figure 6. Any parts which become detached during any other tests required by this standard shall not, without being compressed and whatever their orientation, fit entirely within the small parts cylinder. 6.10 Folding mechanism 6.10.1 Requirements Locking devices are required to prevent a cycle trailer folding whilst a child is in the cycle trailer and also during the process of the child being put into and taken out of the cycle trailer. All locking devices for the folding mechanism shall be positioned so that it is not possible to operate more than one device in a single action. There shall be at least one locking mechanism which fulfils the following: a) the locking mechanism shall be released by at least two consecutive actions, the second being dependent on the first having been carried out and maintained; and b) the locking mechanism shall not be released or damaged in one single action during testing in accordance with 6.10.2. When tested in accordance with 6.10.2, the cycle trailer shall not fold. The locking devices s

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