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Status Report on Operations from September 1996 to August 1997: Final Report
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1997-09-01
[PDF-14.68 MB]
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Edition:Project Summary: September 1996 to August 1997
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Abstract:Four alternative (to loop detection) sensor types were tested in freeway construction areas in Houston. The Whelen Doppler radar units, once attuned to the local conditions, appear to render acceptable speed measures. The side fire microwave ranging sensor (R TMS from EIS) appears to be very suspectable to creating multiple reflections when exposed to hard vertical surfaces (as found in concrete median barriers, abbreviated as CMB). The TraffiCam is a visual imaging device known primarily as an inexpensive, publicly available VIVDS product. Based on the performance of the unit tested, the software and hardware requires substantial improvements before utilization as an acceptable freeway alternative detector. The SmartSonic sensors were installed in an advantageous position for passive monitoring of two lanes of traffic, one sensor per lane. The short-term test indicated that occlusion occurs in sonic as well as VIVDS devices. The Sonic sensor would work best when positioned directly over the lane. The many calibration parameters and expansive range limits may confuse the operator before acceptable volume and speed measures for three length vehicle classes.
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