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Argentinian Technical Requirements and Evaluation of WIM Systems

Poster · May 2019

DOI: 10.13140/RG.2.2.21994.57289

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Prague May 19-23, 2019



Argentinian Technical

Requirements and Evaluation of

WIM Systems

Ignacio*, Moretti, INTI, Argentina Javier, Jorge, INTI, Argentina Julian, Jones, INTI, Argentina José, Amado, INTI, Argentina

* imoretti@inti.gob.ar



Introduction

In 2017, police inspectors conducted roadside inspections that included checking the vehicle's weight and ensuring compliance with transport regulations. They found a truck traveling with twice the permitted load [1]. This situation is not isolated or particular, but happens rather generally. Enforcement is critical, regulations on overloaded vehicles are adequate, however, the problem of persistent overloading stems from the inadequate enforcement of these regulations. This poster introduces some aspects of the draft requirements specification for Weigh-in-motion systems for direct enforcement in Argentina. The first draft document is based on OIML R-134 [2] recommendation as well as COST323 [3] and some newer experiences from countries like Brazil [4], Uruguay [5], Czech Republic [6] and The Netherlands [7].



Methods

Since 2016, several tests were carried out in order to evaluate, not only the metrological performance of different commercial WIM systems, but also the technical viability for the implementation of its use in Argentinian roads.



The assessment process was based on the test methods described in the International Recommendation OIML R 1341:2006 “Automatic instruments for weighing road vehicles in motion and measuring axle loads – Part 1: Metrological and technical requirements – Tests”.



Static measurements



Four different types of technologies for WIM sensors have been installed in this pilot-project by different commercial providers. Instrument “A”: a strain gauge strip sensor. Instrument “B”: a quartz sensor. Instrument “C”: a bending plate sensor. And the last type, “D”: a load cell sensor. Results for 100% of the measurements didn’t meet the expectations. Installation problems and adjustment defects where the main roots of error. Only one of the devices was able to correctly classify all of the vehicles. This aspect is very important in order to automatically set the maximum permitted load, wich deppends on wheel type (single, dual, superwide), and axle distance.



MPE / DMP (%)



Class Total Mass



A



B CDE F



3



5 7 10 15 20



Load per group of axles



5



8 11 15 20 25



Axle load



7



10 15 20 25 30



Table 1:Accuracy Class



Tests were carried out in Larena toll station. The weighing



station is a concrete platform with characteristics



according to the requirements of the European



Recommendation COST 323. The site was classified as



"excellent".



Requieremets



Weighing station



Accuracy Class d (kg)



A



≤ 10



B



≤ 20



C



≤ 20



D



≤ 50



E



≤ 100



F



≤ 200



Table 2:Scale interval



“Argentinian



Technical



Requirements for Weigh-In-



Motion” draft, points out a



system accuracy classification



table. Table 1 describes all



classes and the maximum



permited error (MPE). F type



devices can be useful in a first



stage of implementation and



will



allow



incipient



technologies to be used. The



MPEs are defined for in-service



verification. Type approval and



initial verification requires half



of the MPE. The maximum



admitted values of scale



interval d for each instrument



class are specified in Table 2.



Vehicle classification accuracy



is vital for direct enforcement.



Software and hardware security requirements were also included in the proposal, source code inspection is mandatory. Authentication, Integrity and Non-repudiation of data are also required for consistent data transfers so digital signature algorithms are suggested.

Conclusions



The proposed technical requirements for WIM systems in Argentina includes test suites a similar to OIML for the two axle rigid truck but for all trucks. Since argentinean axle group classification depends on axle distance and wheel type (single, dual, superwide), the specification states that the system must be able to measure the axle distance with a maximum permited error of 10%. Defined WIM classes are feasible and usful in argentinean actual context.

References



1. https://www.lavoz.com.ar/ciudadanos/peligro-andante-en-la-ruta-un-camion-conacoplado-llevaba-la-carga-de-dos



2. OIML (2006), “ Automatic instruments for weighing road vehicles in motion and axle-load measuring. Part 1: Metrological and technical requirements R 134-1.



3. COST323 (1999), European Specification on Weigh-in-Motion of Road Vehicles, EUCO-COST/323/8/99, LCPC, Paris.



4. INMETRO (2016) Portaria número 375/2013 y 47/2016 “Regulamento Técnico Metrológico (RTM) sobre instrumentos de pesagem automáticos de veículos rodoviários”.



5. Uruguay (2006), Decreto N° 500/006, “Reglamento tecnico metrologico de instrumentos para pesaje de vehiculos de transporte por carretera”.



6. CMI (2010), CZ Measure of a general nature, No. 0111-OOP-C010-10, ref. No. 0313/003/10/Pos., 21 May.



7. NMi (2016) International WIM standard Specifications and test procedures for Weigh-in-Motion Systems.



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