Road restraint systems - Truck Mounted Attenuators - Performance classes, impact test acceptance criteria and test performance

This Technical Specification establishes test methods for whole Truck Mounted Attenuator systems (TMAs) under impact..

Rückhaltesysteme an Straßen - Transportfahrzeuggestützte mobile Anprallverzögerer (TMA) - Leistungsklassen, Abnahmekriterien für Anprallprüfungen und Prüfungsleistungen

Diese Technische Spezifikation legt Prüfverfahren für den Anprall an TMA Gesamtsysteme fest.

Dispositifs de retenue routiers - Atténuateurs de choc montés sur camions - Classes de performance, critères d'acceptation des essais de choc et méthodes d'essai

La présente Spécification technique établit les méthodes d’essai pour les dispositifs atténuateurs de choc montés sur camions (TMA) soumis à un choc.

Oprema cest - Blažilnik trka za tovorna vozila (TMA) - Razredi uporabnosti, merila za preskušanje ob naletu in preskus zmogljivosti

Ta tehnična specifikacija določa preskuse zmogljivosti in postopke ocenjevanja za celotne sisteme blažilnikov trka za tovorna vozila (TMA) ob naletu ter vključuje:
– merila za določanje zmogljivosti, sprejemljivosti in moči naleta;
– zahteve za ocenjevanje povezave z mobilnim nosilcem;
– minimalne zahteve za označevanje.

General Information

Status
Published
Publication Date
03-Apr-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
04-Apr-2018
Completion Date
04-Apr-2018

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SLOVENSKI STANDARD
SIST-TS CEN/TS 16786:2018
01-junij-2018

Oprema cest - Blažilnik trka za tovorna vozila (TMA) - Razredi uporabnosti, merila

za preskušanje ob naletu in preskus zmogljivosti

Road restraint systems - Truck Mounted Attenuators - Performance classes, impact test

acceptance criteria and test performance

Rückhaltesysteme an Straßen - Transportfahrzeuggestützte mobile Anprallverzögerer

(TMA) - Leistungsklassen, Abnahmekriterien für Anprallprüfungen und
Prüfungsleistungen

Dispositifs de retenue routiers - Atténuateurs de choc montés sur camions - Classes de

performance, critères d'acceptation des essais de choc et méthodes d'essai
Ta slovenski standard je istoveten z: CEN/TS 16786:2018
ICS:
43.040.80 6LVWHPL]D]DãþLWRSULWUNXLQ Crash protection and
VLVWHPL]D]DGUåHYDQMH restraint systems
SRWQLNRY
43.080.10 Tovornjaki in priklopniki Trucks and trailers
SIST-TS CEN/TS 16786:2018 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 16786:2018
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SIST-TS CEN/TS 16786:2018
CEN/TS 16786
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2018
TECHNISCHE SPEZIFIKATION
ICS 43.040.80; 43.080.10
English Version
Road restraint systems - Truck Mounted Attenuators -
Performance classes, impact test acceptance criteria and
test performance

Dispositifs de retenue routiers - Atténuateurs de choc Rückhaltesysteme an Straßen -

montés sur camions - Classes de performance, critères Transportfahrzeuggestützte mobile Anprallverzögerer

d'acceptation des essais de choc et méthodes d'essai (TMA) - Leistungsklassen, Abnahmekriterien für

Anprallprüfungen und Prüfungsleistungen

This Technical Specification (CEN/TS) was approved by CEN on 13 November 2017 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to

submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS

available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in

parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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: Rue de la Science 23, B-1040 Brussels

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16786:2018 E

worldwide for CEN national Members.
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CEN/TS 16786:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Abbreviations ................................................................................................................................................... 6

5 Test parameters............................................................................................................................................... 7

5.1 Test site ............................................................................................................................................................... 7

5.2 Test vehicles ...................................................................................................................................................... 7

5.2.1 Impacting vehicles .......................................................................................................................................... 7

5.2.2 Mobile carrier ................................................................................................................................................... 8

5.2.3 Location of the ATD ........................................................................................................................................ 9

5.3 Test matrix ........................................................................................................................................................ 9

5.4 Accuracies and limit deviations of impact speeds and approach angle ................................... 12

5.4.1 Vehicle impact speed .................................................................................................................................. 12

5.4.2 Vehicle approach angle .............................................................................................................................. 12

5.4.3 Combined limit deviation of speed and angle .................................................................................... 12

6 Photographic coverage .............................................................................................................................. 13

7 Information to be reported ...................................................................................................................... 14

7.1 General ............................................................................................................................................................. 14

7.2 General test information ........................................................................................................................... 14

7.3 Structural adequacy .................................................................................................................................... 14

7.4 Deformation of mobile carrier ................................................................................................................ 14

7.5 Deformation of impacting vehicle .......................................................................................................... 15

7.6 Trajectory of the whole system ............................................................................................................... 15

7.7 Trajectory of impacting vehicle .............................................................................................................. 15

7.8 Severity indices ............................................................................................................................................. 15

8 Evaluation criteria ....................................................................................................................................... 16

8.1 General ............................................................................................................................................................. 16

8.2 Structural adequacy .................................................................................................................................... 16

8.3 Deformation of impacting vehicle and mobile carrier ................................................................... 16

8.4 Trajectory of impacting vehicle .............................................................................................................. 16

8.5 Severity index ................................................................................................................................................ 16

Bibliography ................................................................................................................................................................. 17

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CEN/TS 16786:2018 (E)
European foreword

This document (CEN/TS 16786:2018) has been prepared by Technical Committee CEN/TC 226 “Road

equipment”, the secretariat of which is held by AFNOR.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

According to the CEN/CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to announce this Technical Specification: 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.
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SIST-TS CEN/TS 16786:2018
CEN/TS 16786:2018 (E)
Introduction

Truck Mounted Attenuators (TMAs) are designed to protect occupants of impacting passenger motor

vehicles from impacts with the rear of stationary or slow-moving mobile carriers used in work zones and

during maintenance operations. During an impact with a TMA, the mobile carrier is accelerated forward

as the impacting vehicle is decelerated. This can, in turn, pose a risk to road workers in front of the

support vehicle.

This Technical Specification aims to conduct impact testing of whole TMA systems to establish the

severity of an impact with the whole system, and to establish the trajectory of the impacting vehicle and

mobile carrier following the impact.
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CEN/TS 16786:2018 (E)
1 Scope

This Technical Specification establishes test methods for whole Truck Mounted Attenuator systems

(TMAs) under impact.
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 1317-1:2010, Road restraint systems — Part 1: Terminology and general criteria for test methods

EN 13036-4, Road and airfield surface characteristics — Test methods — Part 4: Method for measurement

of slip/skid resistance of a surface: The pendulum test
ISO 8349, Road vehicles — Measurement of road surface friction
ISO 10392, Road vehicles — Determination of centre of gravity
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
whole system
TMA, mobile carrier and any elements connecting the TMA and the mobile carrier
3.2
TMA

energy absorbing device fitted to a mobile carrier to reduce the severity of an impact with an impacting

vehicle
3.3
mobile carrier
vehicle to which the TMA is attached
3.4
impacting vehicle
motor vehicle impacting the whole system during the type test
3.5
vehicle
any motor vehicle or its trailer as defined in 3.5.1 and 3.5.2
3.5.1
motor vehicle

any power-driven roadworthy vehicle which is moved by its own means, having four or more wheels

3.5.2
trailer

any non-self-propelled vehicle on wheels which is designed and constructed to be towed by a motor

vehicle
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CEN/TS 16786:2018 (E)
3.6
testing laboratory

competent laboratory which measures, examines, tests, calibrates or otherwise determines the

characteristics or performance of materials or products within the scope of this document

Note 1 to entry: A laboratory accredited by a signatory of the European co-operation for accreditation or the

appropriate statutory instrument, within the scope of this document, in the territory where the test was executed

may be presumed to be competent.
3.7
test site

location of the whole system prior to the test, and the approach, exit path and roll ahead distance for the

impacting vehicle and mobile carrier
3.8
energy absorbing element

any part of the TMA or connection piece which is designed, or shown, to absorb energy during an impact

by static and/or dynamic deformation and/or attenuation, as reported in at least one of the impact test

reports
3.9
roll ahead

distance that the mobile carrier moves forward after impact by the impacting vehicle

3.10
test inertial mass

impacting vehicle and/or mobile carrier as delivered, including all fluids or fluid replacement if the actual

vehicle fluids have been drained, plus ballast and recording and brake equipment, but excluding ATD

3.11
total mass

mass which includes all items in, on, or attached to, the impacting vehicle or whole system at the

beginning of the test
3.12
automatic impact brake
system which automatically applies the air brakes on a mobile carrier
4 Abbreviations
For the purposes of this document, the following abbreviations apply.
AIB Automatic Impact Brake
ASI Acceleration Severity Index
ATD Anthropomorphic Test Device
PTV Pendulum Test Value
RFLAT Roll Ahead Distance (on flat ground, as defined in EN 1317-1:2010, 5.1)
SRT Skid- Resistance Tester
THIV Theoretical Head Impact Velocity
TMA Truck Mounted Attenuator
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CEN/TS 16786:2018 (E)
VCDI Vehicle Cockpit Deformation Index
5 Test parameters
5.1 Test site

The test site shall be as specified in EN 1317-1:2010, 5.1 and shall extend for a sufficient length forward

of the mobile carrier to allow for the measurement of the roll ahead distance. The test site shall also be

sufficiently wide to assess the redirection trajectory of the impacting vehicle.

Asphaltic or concrete surfaces shall be used. Actions shall be taken to minimize dust generation.

A friction test shall be performed in the impact area in accordance with ISO 8349 in dry conditions to

estimate the friction coefficient. The friction of the surface of the test site (asphalt or concrete) shall be

measured with the Portable Skid- Resistance Tester (SRT) according to EN 13036-4. Friction value and

class shall be included in the test report. Also alternative friction testers in line with the statement in

EN 1436:2007+A1:2008, 4.5, can be used. EN 13036-4 calls the measuring device a Pendulum Tester and

uses it to determine the Pendulum Test Value (PTV) which gives an indication about the skid/slip

resistance of a surface. All details shall be included in the test report.

Conditions such as a polished surface or a bleeding asphalt surface that could lower available tyre-

pavement friction shall not be used. Gravel or any other particulate shall not be added to the test area to

alter the tyre-pavement friction.
5.2 Test vehicles
5.2.1 Impacting vehicles

The 900 kg impacting vehicle shall meet the requirements of EN 1317-1:2010, 5.2 and EN 1317-1:2010,

Table 1.
The 2 000 kg impacting vehicle
...

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