United States Department of Transportation
i
Feasibility study for using video detection system data to supplement automatic traffic recorder data.
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2013-12-01
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[PDF-2.55 MB]
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Abstract:The objective of this study was to determine the feasibility of incorporating Georgia NaviGAtor
traffic volume data with Georgia Department of Transportation (GDOT) traffic volume data to
enhance federal reporting. Some of the pertinent conclusions from this study are:
1. Accuracy of video detection system (VDS) counts varied from site to site and lane to lane.
2. Accuracy for VDS with gantry-mounted cameras was not significantly better than that of
pole-mounted VDS sites.
3. Accuracy of VDS sites with cameras mounted on 36 ft. offset poles was marginally lower
than units with cameras mounted on 24 ft. offset poles.
4. Accuracy of counts from VDSs and remote traffic microwave sensors (RTMSs) is sensitive to site-specific deployment characteristics.
5. There is a likely limit to the number of lanes that may be accurately counted by a single
VDS unit.
6. Counts aggregated over all lanes provide the highest accuracy.
7. Given the variability in data quality across detection stations, the use of VDS data to supplement GDOT data should be considered on a detector-by-detector basis (i.e. the data
from a detector need to be individually checked for quality against ground truth data before they are used for federal reporting purposes).
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