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ISO 9001:2008 Registered
7
IN-GROUND
Weight Enforcement is vital to minimize the damage
caused by overloaded vehicles to roads and highways,
and to increase safety for the operators. Detection of
these vehicles at high speeds (HS-WIM) is an efficient
and effective method for screening for enforcement
or pre-selection of vehicles for static weigh stations.
Strip sensors for pre-selection or enforcement incorporate strain gauge
sensor technology:
• WIM Site Installation Employs Four to Six Sensors, Loop & Electronics
• Consistent Accuracy for Selection of Vehicles from Screening
• Improve Vehicle & Operator Safety
• Simple Integration of Sensors into Existing Enforcement Systems
Regions can have different requirements for accuracy
of systems employed in screening for enforcement
WIM systems. COST 323 A(5) and COST 323 B+(7)
are commonly referenced for these screening for
enforcement sites. Six sensors (three pairs) have
been used in some countries for these applications.
Performance of WIM sites have a Gross Vehicle Weight
(GVW) accuracy for screening for enforcement meeting
or exceeding ASTM 1318 Type III and COST 323 B+(7)
WIM requirements.
ENFORCEMENT & PRE-SELECTION
Typical Sensor Configurations
ENFORCEMENT & PRE-SELECTION | CASE STUDY
OREGON DOT: PRE-SELECTION
The state of Oregon in the US has used pit-type Weigh-In-Motion scales
for pre-selection in the mainline for many years. Though pleased with the
accuracy the scales delivered, the cost of installation and the ongoing
maintenance required led the state to evaluate different HS-WIM options.
Familiar with the benefits of strain gauge technology, Oregon DOT (ODOT)
chose to test Intercomp strip sensors as a WIM sensor replacement integrated
into their current electronics and software.
Pilot sites with four sensors in two rows were installed to conduct evaluations of possible WIM replacement scales
and sensors. Vehicles crossed the mainline WIM sites at speeds ranging from 40-80mph (65-130kph), and these
vehicle records were compared to weights gathered with static scales at weighstations downstream from the
WIM sites.
These sites were operated by the ODOT, and when comparing the data from WIM to static scales, performance
of 3-4% GVW error were found in diverse weather conditions over time.
This confirmed ODOTs previous positive experience with strain gauge WIM technology, but Intercomp supplies this
performance in a smaller, easier to install strip sensor. In the future, when replacing current or creating new WIM
sites, the State of Oregon has committed to use Intercomp strip sensors for their High-Speed WIM mainline technology.
