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Roadway Information and Traffic Counts
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Weigh-in-Motion System
WIM, as defined by the American Society for Testing and Materials
(ASTM), is “the process of measuring the dynamic tire forces of a
moving vehicle and estimating the corresponding tire loads of the
static vehicle”.
Interest in the number of heavy vehicles operating on roadways in
North America grew in parallel with road construction growth. It has
been apparent that heavy vehicles are a major component to road damage
and important in bridge design. It is also apparent that there are
limitations associated with static scales and their ability to enforce
weight limits and to collect unbiased data.
In addition to weight data, WIM sites collect a variety of traffic
data. Data includes traffic volume, speed, directional distribution,
lane distribution, date and time of passage, axle spacing, and vehicle
classification.
The PDF files below are in Portable Document Format (PDF). You will
need Adobe Acrobat Reader to view the PDF file, which is available
free from our state
Adobe access page.
Permanent Weigh-in-Motion (WIM) System Sites
2012 WIM Site Locations List
(pdf 360k)
2012 WIM Site Locations Map
(pdf 1.7m)
Truck Weight Monitoring
2011 Equivalent Single Axle Load (ESAL) Design Factors
(pdf 282k)
Speed Monitoring
2011 Weekday Average Speed (pdf 5.8m)
Speed Information
Vehicle Classification Monitoring
Vehicle Classification Scheme
Vehicle Classification reports at WIM Sites
2011 Weekday (pdf 8.6m)
2011 Weekend (pdf 8.6m)
2011 Combined (pdf 8.5m)
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