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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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Argentinian Technical
Requirements and Evaluation of
WIM Systems
Prague
May 19-23, 2019
Ignacio*, Moretti, INTI, Argentina
Javier, Jorge, INTI, Argentina
Julian, Jones, INTI, Argentina
José, Amado, INTI, Argentina
* imoretti@inti.gob.ar
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.
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
The assessment process was based on the test methods described in the International Recommendation OIML R 134-1:2006 “Automatic instruments for weighing road vehicles in motion and measuring axle loads – Part 1: Metrological and technical requirements – Tests”.
1. https://www.lavoz.com.ar/ciudadanos/peligro-andante-en-la-ruta-un-camion-con-acoplado-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.
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".
Introduction
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.
Requieremets
“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.
Static measurements
Weighing station
Accuracy Class d (kg)
A ≤ 10
B ≤ 20
C ≤ 20
D ≤ 50
E ≤ 100
F ≤ 200
Table 2:Scale interval
MPE / DMP (%)
Class A B C D E F
Total Mass 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
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