Technology Profile |
WIM sensors for
enforcement and tolling
Advances in weigh-inmotion
| Need to know
Key features of
Intercomp’s WIM strip
sensors include:
Traffic Technology International July/August 2019
www.TrafficTechnologyToday.com
066
(WIM) technology
have accelerated over the
past decade, with performance
climbing through metrological
standards and outpacing legally
accepted uses in almost every
geography. With those advances
comes an increased focus on the
capabilities and legal acceptance
of WIM, as deployments
demonstrate the effectiveness of
the weighing methodology for
applications traditionally
reserved for static weighing.
Mainline high-speed WIM
installations have provided data
collection and screening for
enforcement weight data for
many years and will continue to
do so in the future. But legal
acceptance wasn’t required for
such uses, because performance
for data collection was good
enough for traffic and statistics.
Screening for enforcement lead
to weighing on certified static
scales. Standards such as ASTM
(formerly the American Society
for Testing and Materials) E-1318
(US) and COST323 (Europe)
provide WIM guidelines that
are widely accepted for system
performance, but NTEP (US) and
OIML (Europe) are where legally
enforceable metrology resides.
For vehicle weighing, OIML
R134 is the most comprehensive
and widely accepted
metrological standard for WIM
systems that are currently
into a variety of systems, as well
as working to link the sensors
with the integrating electronics
and software. Intercomp Strip
sensors are fitted and grouted in
place into 3in (75mm) channels
cut into the pavement.
Incorporating the sensors into
the roadway takes a single day
per lane with minimal
disruption to traffic.
Pieces in the WIM puzzle
This flexibility allows road
operators to build upon certified
sensors when developing
weighing systems for national
or regional approvals.
> Quick installation into 3in
(75mm) deep channels in
road surfaces
> Suitable for tolling and
enforcement applications
Main image: Intercomp
strip sensors can weigh
vehicles traveling at
speeds up to 80mph
(130 km/h)
Above: An installation
of four OIML-certified
Class 5 sensors
available. With the desire to
realize the efficiency that WIM
systems offer for applications
such as direct enforcement or
tolling by weight, many countries
look to the OIML standard when
creating legislation and testing
procedures for legal acceptance.
High-speed certification
To that end, Intercomp WIM
Strip Sensors have been tested
and passed OIML R134
certification at both low and
high speeds. The sensors, when
installed in two-, three-, or fourrow
configurations, achieved
OIML Class 10 up to 100km/h
(62mph) and Class 5, with four
rows at lower speeds.
Certification up to mainline
speeds enables these sensors to
be use for direct enforcement or
electric toll collection (ETC)
where WIM is allowed.
In many cases,
manufacturers of in-road
weighing scales and sensors
design them to be incorporated
/www.TrafficTechnologyToday.com