Weigh-in-Motion of road vehicles - Requirements

1.1   This standard specifies the requirements for installation, calibration, performance and accuracy assessment, and test methods for Weigh-in-Motion (WIM) systems, that are used to determine gross weights, axle and group-of-axle loads for road vehicles when they are weighed in motion.
1.2   This standard applies to:
1.2.1   WIM systems installed on road infrastructure (including bridges), but not to the WIM systems installed on-board of vehicles;
1.2.2   High speed WIM (HS-WIM) systems, i.e. systems installed in one or more traffic lane(s) of a road, and operated automatically under normal traffic conditions, and to low speed WIM (LS-WIM) systems, i.e. systems installed in a controlled weighing area, and operated under controlled conditions;
1.2.3   WIM systems using either scales which are able to weigh standard masses statically, or other sensors which may measure the loads indirectly;
1.2.4   on-site full WIM system performance assessment and model (type) approval, but excludes laboratory (product) tests or tests on parts of systems (e.g. sensors only).
1.6   The scope of this standard covers all WIM applications, except trade.
NOTE   For load enforcement of road vehicles, this standard or the OIML (International Organization for Legal Metrology) international recommendation R 134-1 and 134-2 (OIML, 2004 and 2006) applies, depending on the national requirements and legislation.
1.7   WIM systems used for trade are dealt with in the OIML recommendations R134-1 and R134-2 (OIML, 2006 and 2004). These OIML recommendations apply to WIM systems installed in controlled weighing areas, on a specified apron and where the vehicle speed is controlled. They mainly apply to WIM systems composed of scales, which are capable of weighing standard masses statically. The OIML recommendations are limited to the highest accuracy classes (0,2 to 10), with tolerances for 100 % of the measurements.
This standard applies to any WIM system, which may be installed either in a controlled weighing area, or on a road open to traffic. These systems may use road sensors and bridge WIM.
This standard covers type approval testing, initial and in service testing.
This standard specifies the required performance and ability of WIM systems in general, but does not aim to standardize products.

Wägung von Fahrzeugen während der Fahrt - Anforderungen

Pesage en marche des véhicules routiers - Exigences

1.1 Le présent document spécifie les exigences d’installation, d’étalonnage, de performance et d’évaluation de l’exactitude, ainsi que les méthodes d’essai applicables aux systèmes de pesage en marche.  1.2 Le présent document s’applique aux systèmes de pesage en marche (WIM) des véhicules routiers externes ou internes à l’infrastructure en place. 1.3 Le présent document s’applique d'une part aux systèmes de pesage en marche à haute vitesse (HS-WIM), c’est-à-dire les systèmes installés sur une ou plusieurs voies de circulation, et à fonctionnement automatique dans des conditions de trafic normales, et d'autre part aux systèmes de pesage en marche à basse vitesse (LS-WIM), c’est-à-dire les systèmes installés dans une zone de pesage spécifique, à l’extérieur de la ou des voies normales de circulation vers lesquelles une autorité compétente (par exemple la police) dirige les véhicules destinés à être soumis au pesage. 1.4 Le présent document s’applique à l’évaluation des performances et à l’homologation des modèles de systèmes de pesage en marche complets montés sur site, mais exclut toutefois les essais (de produits) en laboratoire ou les essais effectués sur des parties de systèmes (par exemple uniquement des capteurs). 1.5 Le domaine d’application du présent document couvre tous les besoins en matière de pesage en marche, à l’exception des systèmes destinés à être commercialisés. NOTE La recommandation de l’OIML (Organisation Internationale de Métrologie Légale) s’applique (OIML, 2004 & 2006) pour toutes les questions d’ordre commercial et juridique. Pour l’application des charges de véhicules routiers, l’une ou l’autre de ces recommandations peut s’appliquer, selon les exigences et la législation nationales.

Tehtanje cestnih vozil v gibanju

General Information

Status
Not Published
Current Stage
5060 - Closure of Vote - Formal Approval
Due Date
18-Oct-2016
Completion Date
18-Oct-2016

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SLOVENSKI STANDARD
kSIST FprEN 17019:2016
01-oktober-2016
Tehtanje cestnih vozil v gibanju
Weigh-in-Motion of Road Vehicles
Wägung von Fahrzeugen während dem Fahrt
Pesage en marche des véhicules routiers
Ta slovenski standard je istoveten z: FprEN 17019
ICS:
17.100 Merjenje sile, teže in tlaka Measurement of force,
weight and pressure
43.180 'LDJQRVWLþQDYGUåHYDOQDLQ Diagnostic, maintenance and
SUHVNXVQDRSUHPD test equipment
kSIST FprEN 17019:2016 en,fr,de

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

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kSIST FprEN 17019:2016
FINAL DRAFT
EUROPEAN STANDARD
FprEN 17019
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2016
ICS 17.100
English Version
Weigh-in-Motion of road vehicles - Requirements

Pesage en marche des véhicules routiers - Exigences Wägung von Fahrzeugen während der Fahrt -

Anforderungen

This draft European Standard is submitted to CEN members for formal vote. It has been drawn up by the Technical Committee

CEN/SS F05.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprEN 17019:2016 E

worldwide for CEN national Members.
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Contents Page

European foreword .......................................................................................................................................................4

Introduction .....................................................................................................................................................................5

1 Scope ....................................................................................................................................................................6

2 Normative references ....................................................................................................................................6

3 Terms, definitions, symbols and abbreviations ...................................................................................7

3.1 Terms and definitions taken from the Vocabulary of International Metrology .......................7

3.2 Specific statistical and metrological terms and definitions .......................................................... 10

3.3 Terms and definitions related to vehicles ........................................................................................... 11

3.4 Terms and definitions related to WIM systems ................................................................................. 13

3.5 List of symbols and abbreviations .......................................................................................................... 14

4 Site selection criteria................................................................................................................................... 15

4.1 Road geometry ............................................................................................................................................... 15

4.2 Pavement characteristics .......................................................................................................................... 15

4.3 WIM site classes (not for B-WIM) ............................................................................................................ 16

4.4 Particular requirements for bridges ..................................................................................................... 17

5 Operating conditions and environmental requirements ............................................................... 18

5.1 General conditions ....................................................................................................................................... 18

5.2 Sensors requirements ................................................................................................................................. 19

5.3 Electronics requirements .......................................................................................................................... 20

6 Accuracy class tolerances with respect to the weights ................................................................... 20

6.1 General clauses – Detailed procedure ................................................................................................... 20

6.2 General – Simplified procedure ............................................................................................................... 21

6.3 Accuracy classes ............................................................................................................................................ 21

6.4 Other tolerances............................................................................................................................................ 24

6.5 Reference gross weights and axle loads measured statically ....................................................... 24

7 On-site system checks and calibration ................................................................................................. 25

7.1 General clauses .............................................................................................................................................. 25

7.2 Definitions of test conditions ................................................................................................................... 25

7.3 Minimum required test conditions ........................................................................................................ 26

7.4 Calibration methods .................................................................................................................................... 26

8 Type (model) approval ............................................................................................................................... 29

8.1 General ............................................................................................................................................................. 29

8.2 Choice of test site .......................................................................................................................................... 29

8.3 Installation and pre-calibration of the system .................................................................................. 29

8.4 Test plan ........................................................................................................................................................... 30

8.5 Reference static loads and weights ........................................................................................................ 30

8.6 Test analysis and report ............................................................................................................................. 31

9 Initial and in-service verifications ......................................................................................................... 31

9.1 Initial verification ......................................................................................................................................... 31

9.2 In-service verification ................................................................................................................................. 31

10 Procedure to check the accuracy of a WIM system by testing ...................................................... 32

10.1 General rules – Detailed procedure ....................................................................................................... 32

10.2 General rules – Simplified procedure ................................................................................................... 32

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10.3 Test plans – Detailed procedure.............................................................................................................. 32

10.4 Test plans – Simplified procedure .......................................................................................................... 33

10.5 Minimum required confidence levels – Detailed procedure ........................................................ 33

10.6 Minimum required confidence levels – Simplified procedure ..................................................... 34

10.7 Test results analysis – Detailed procedure ......................................................................................... 34

10.8 Test results analysis – Simplified procedure ...................................................................................... 38

11 Data storage and transmission ................................................................................................................ 38

11.1 Data storage .................................................................................................................................................... 38

11.2 Data transmission ........................................................................................................................................ 40

11.3 Operating ranges and information ......................................................................................................... 40

Annex A (informative) Comparison of this Standard and the OIML R 134-1

International Recommendation .............................................................................................................. 41

A.1 General ............................................................................................................................................................. 41

A.2 Scope and application ................................................................................................................................. 41

A.3 Detailed comparison of the OIML R 134-1 and this EN standard scope and

requirements ................................................................................................................................................. 42

Annex B (informative) Standard test plans and simplified acceptance procedures ........................... 44

B.1 Examples of standardized test plans ..................................................................................................... 44

B.2 Charts for acceptance tests ....................................................................................................................... 47

B.3 Acceptance tests: simplified procedures ............................................................................................. 48

Annex C (informative) Calibration methods ...................................................................................................... 50

Annex D (informative) Standard results’ format and computer tools for accuracy

assessment, and implementation (example)...................................................................................... 53

D.1 Standard results’ format and computer tools for accuracy assessment ................................... 53

D.2 Example of implementation of the checking procedures .............................................................. 54

Annex E (informative) Comments .......................................................................................................................... 61

E.1 Scope ................................................................................................................................................................. 61

E.2 Terms and definitions ................................................................................................................................. 61

E.3 User and performance requirements .................................................................................................... 62

E.4 Criteria for the choice of WIM sites ........................................................................................................ 64

E.5 Operating conditions and environmental requirements ............................................................... 68

E.6 Accuracy class tolerances with respect to the weight ..................................................................... 68

E.7 On-site system checks and calibration by testing ............................................................................. 69

E.8 Type (model) approval of a WIM system ............................................................................................. 71

E.9 Procedure to check the accuracy of a WIM system ........................................................................... 72

E.10 Data storage and transmission ................................................................................................................ 72

E.11 COST 323 vehicle classification ............................................................................................................... 73

Bibliography ................................................................................................................................................................. 74

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European foreword

This document (FprEN 17019:2016) has been prepared by Technical Committee CEN/SS F05

“Measuring Instruments”, the secretariat of which is held by CCMC.
This document is currently submitted to the Formal Vote.

This European Standard has been prepared by the FiWi (FEHRL institutes WIM initiative)

working group and is based on the European Specification on WIM of Road Vehicles (COST323,

1999) published in 1999 by the COST323 Management Committee. The statistical background

may be found in (Jacob, 2002) and the technical references in (Jacob et al., 2002).

This standard was prepared to deal with aspects related to:
— scope, normative references, terminology and symbols (Clauses 1 to 3);

— site selection, operating conditions and environmental requirements (Clauses 4 and 5);

— accuracy classification (Clause 6);
— system calibration and testing (Clauses 7 to 11);
The informative Annexes A, B, C, D and E provide respectively:
— comparison with the OIML R134-1 international recommendation;
— standard test plans and simplified acceptance procedures;
— guidelines for system calibration;

— guidelines for data and test result presentation, and computer tools for accuracy

assessment;
— comments and explanations of the main clauses.
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Introduction

This standard comprises comprehensive and detailed requirements based on a scientific and

technical background developed in the COST323 action (Jacob, O’Brien and Jehaes, 2002). The

procedure for assessing the accuracy of a WIM system is flexible and general. It may use almost

any test plan, depending on the context and means available. The whole standard is based on a

statistical approach of the accuracy assessment, with tolerances which are the boundaries of

confidence intervals, and a level of confidence, reflecting the probability that an individual

measure lays in the specified tolerances or in the confidence interval. This level of confidence

can be specified by the users, depending on the application.

However, several users and WIM manufacturers expressed the need to have a simplified

procedure for common tests and applications, easier to implement and to understand. Therefore

a simplified procedure adapted to standard test plans and with a fixed level of confidence of

95 % was developed. Wherever possible, the detailed clauses of this standard were simplified to

allow common users to easily assess a WIM system accuracy.

When a simplified approach is available, the section concerned is duplicated as follows:

— Section title – Detailed procedure,
— Section title – Simplified procedure,
and they are numbered with consecutive numbers at the same level.

The clauses of the simplified procedure may be applied instead of those of the detailed

procedure, if respecting the conditions of application.

The simplified procedure mainly applies for the check of the accuracy of a WIM system

(Clause 10). The condition is to fix the confidence level at 95 %. The acceptance test can be done

using approximate analytical formula (Annex B, B.3.1) or one of the four standard test plans

proposed (Annex B, B.1)and charts (Annex B, B.2).
More in details:

— Clauses 1 to 5, 7 to 9 and 11 are common to the detailed and simplified procedures;

— in Clause 6 (Accuracy classes tolerances) the simplified procedure only deals with fixed

accuracy classes referred by a letter and a number (e.g. B(10)) as stated in 6.2, while the detailed

procedure also includes interpolated classes (6.1 and 6.3.4);

— the detailed procedure to check the accuracy by testing is given in 10.1, 10.3, 10.5 and 10.7,

while the simplified procedure is described in 10.2, 10.4, 10.6 and 10.8, using the standard test

plans given in the Annex B.
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1 Scope

1.1 This standard specifies the requirements for installation, calibration, performance and

accuracy assessment, and test methods for Weigh-in-Motion (WIM) systems, that are used to

determine gross weights, axle and group-of-axle loads for road vehicles when they are weighed

in motion.
1.2 This standard applies to:

1.2.1 WIM systems installed on road infrastructure (including bridges), but not to the WIM

systems installed on-board of vehicles;

1.2.2 High speed WIM (HS-WIM) systems, i.e. systems installed in one or more traffic lane(s)

of a road, and operated automatically under normal traffic conditions, and to low speed WIM

(LS-WIM) systems, i.e. systems installed in a controlled weighing area, and operated under

controlled conditions;

1.2.3 WIM systems using either scales which are able to weigh standard masses statically, or

other sensors which may measure the loads indirectly;

1.2.4 on-site full WIM system performance assessment and model (type) approval, but

excludes laboratory (product) tests or tests on parts of systems (e.g. sensors only).

1.6 The scope of this standard covers all WIM applications, except trade.

NOTE For load enforcement of road vehicles, this standard or the OIML (International Organization

for Legal Metrology) international recommendation R 134-1 and 134-2 (OIML, 2004 and 2006) applies,

depending on the national requirements and legislation.

1.7 WIM systems used for trade are dealt with in the OIML recommendations R134-1 and

R134-2 (OIML, 2006 and 2004). These OIML recommendations apply to WIM systems installed

in controlled weighing areas, on a specified apron and where the vehicle speed is controlled.

They mainly apply to WIM systems composed of scales, which are capable of weighing standard

masses statically. The OIML recommendations are limited to the highest accuracy classes (0,2 to

10), with tolerances for 100 % of the measurements.

This standard applies to any WIM system, which may be installed either in a controlled weighing

area, or on a road open to traffic. These systems may use road sensors and bridge WIM.

This standard covers type approval testing, initial and in service testing.

This standard specifies the required performance and ability of WIM systems in general, but

does not aim to standardize products.
2 Normative references

The following referenced documents are indispensable for the application of this document. For

dated references, only the edition cited applies. For undated references, the latest edition of the

referenced document (including any amendments) applies.

ISO 3534-1:2006, Statistics — Vocabulary and symbols — Part 1: General statistical terms and

terms used in probability

ISO 3534-2:2007, Statistics — Vocabulary and symbols — Part 2: Applied statistics

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ISO/IEC Guide 99:2007, International vocabulary of metrology — Basic and general concepts and

associated terms (VIM)
3 Terms, definitions, symbols and abbreviations

For the purposes of this document, the terms and definitions given in the Glossary of WIM terms

of the COST 323 final report (Jacob et al., 2002), in ISO 3534-1 and ISO 3534-2, in ISO/IEC Guide

99:2007 and the following apply.
3.1 Terms and definitions taken from the Vocabulary of International Metrology
3.1.0
quantity

property of a phenomenon, body, or substance, to which a magnitude can be assigned

3.1.1
measurement

process of experimentally obtaining information about the magnitude of a quantity

3.1.2
measurand
quantity intended to be measured
3.1.3
measurement method/procedure

generic description of a logical sequence of operations used in a measurement / detailed

description of a measurement according to one or more measurement principles and to a given

measurement method
3.1.4
measurement result
information about the magnitude of a quantity, obtained experimentally
3.1.5
measurement uncertainty

parameter that characterizes the dispersion of the quantity values that are being attributed to a

measurand, based on the information used
3.1.6
standard (measurement) uncertainty
measurement uncertainty expressed as a standard deviation
3.1.7
calibration

(a) operation establishing the relation between quantity values provided by measurement

standards (French “étalon”) and the corresponding indications of a measuring system, carried

out under specified conditions and including evaluation of measurement uncertainty; or

(b) operation that establishes the relation, obtained by reference to one or more measurement

standards (French “étalon”), that exists under specified conditions, between the indication of a

measuring system and the measurement result that would be obtained using the measuring

system
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3.1.8
(metrological) traceability

property of a measurement result relating the result to a stated metrological reference through

an unbroken chain of calibrations of a measuring system or comparisons, each contributing to

the stated measurement uncertainty
3.1.9
verification

confirmation through examination of a given item and provision of objective evidence that it

fulfils specified requirements
3.1.10
influence quantity

quantity which, in a direct measurement, is not the quantity being measured, but whose change

affects the relation between the indication of the measuring system and the measurement result

3.1.11
Correction

modification applied to a quantity value obtained from measurement, to compensate for a

systematic effect
3.1.12
(measurement) precision

closeness of agreement between quantity values obtained by replicate measurements of a

quantity, under specified conditions
3.1.13
measuring instrument
device or combination of devices designed for measurement of quantities
3.1.14
measuring transducer

device that provides at its output a quantity having a determined relation to the quantity at its

input
3.1.15
measuring system

set of measuring instruments and other devices or substances assembled and adapted to the

measurement of quantities of specified kinds within specified intervals of values

3.1.16
sensor

element of a measuring system that is directly affected by the phenomenon, body, or substance

carrying the quantity to be measured
3.1.17
detector

device or substance that indicates the presence of a phenomenon, body, or substance when a

threshold value of an associated quantity is exceeded
3.1.18
adjustment

set of operations carried out on a measuring system in order that it provide prescribed

indications corresponding to given values of the quantity to be measured
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3.1.19
measuring interval

set of values of the quantities of the same kind that can be measured by a given measuring

system, with specified measurement uncertainty under defined conditions
3.1.20
steady state condition

operating condition of a measuring system in which the possible variation with time of the

quantity being measured is such that a calibration of the measuring system carried out with a

measurand constant with time remains valid
3.1.21
rated operating condition

condition that shall be fulfilled during measurement in order that a measuring system perform

as designed
3.1.22
limiting condition

extreme condition that a measuring system is required to withstand without damage, and

without degradation of specified metrological characteristics when it is subsequently operated

under its rated operating conditions
3.1.23
reference condition

condition of use prescribed for evaluating the performance of a measuring system or for

comparison of measurement results
3.1.24
resolution

smallest change, in the value of a quantity being measured by a measuring system, that causes a

perceptible change in the corresponding indication
3.1.25
stability

ability of a measuring system to maintain its metrological characteristics constant with time

3.1.26
drift

change in the indication of a measuring system, generally slow and continuous, related neither

to a change in the quantity being measured nor to a change of an influence quantity

3.1.27
instrumental uncertainty

component of measurement uncertainty attributed to a measuring instrument and determined

by its calibration
3.1.28
accuracy class

class of measuring instruments that meet stated metrological requirements which are intended

to keep instrumental uncertainty within specified limits under specified operating conditions; or

class of measuring instruments that meet stated metrological requirements which are intended

to keep errors (3.1.32) within specified limits under specified operating conditions

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3.1.29
true value (of a quantity)

quantity value consistent with the definition of a quantity. Also an accepted reference to which a

measurement (result) is compared to assess an error
3.1.30
accuracy of a measurement

closeness of agreement between a quantity value obtained by measurement and the true value

of the measurand
Accuracy of a measuring system:

ability of a measuring system to provide a quantity value close to the true value of a measurand

3.1.31
trueness

closeness of agreement between the average that would ensue from an infinite number of

quantity values obtained under specified measurement conditions and the true value of the

measurand
3.1.32
error

difference of quantity value obtained by measurement and true value of the measurand

3.1.33
random error

difference of quantity value obtained by measurement and average that would ensue from an

infinite number of replicated measurements of the same measurand carried out under

repeatability conditions
3.1.34
systematic error

difference of average that would ensue from an infinite number of replicated measurements of

the same measurand carried out under repeatability conditions and true value of the measurand

3.1.35
maximum permissible error

one of the two extreme values of the error permitted by specifications or regulations for a given

measuring system
3.1.36
intrinsic error (of a measuring system)
error of indication when determined under reference conditions
3.1.37
bias (of a measuring system)
systematic error of indication of a measuring system
3.2 Specific statistical and metrological terms and definitions
3.2.1
confidence interval

interval which contains the true value of a quantity value represented by a random variable,

with a given probability, π, or a minimum required probability π
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3.2.2
confidence level
proba
...

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