United States Department of Transportation
i
Field evaluation of smart sensor vehicle detectors at intersections - volume 1 : normal weather conditions.
-
2012-10-01
[PDF-1.33 MB]
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:Microwave-based vehicle detection products from two manufacturers were selected for field testing and
evaluation: Wavetronix and Intersector. The two systems were installed by the manufacturer/distributor at a
signalized intersection. Initial evaluation was performed and the results were shared with the companies. They
were given an opportunity to change or fine-tune the systems’ setup, if they wanted, resulting in a modified
setup. Results are presented in this report in terms four types of errors (false, missed, stuck-on, and dropped
calls). At the stop bar, at least 94% of detections for Wavetronix and 96% for Intersector were correct. At stop
bar zones, the overall occurrence of false calls for Wavetronix ranged from 0.56% to 1.62%. Missed calls were
low for Zones 1 and 2 (0.13% and 0.43%) but significantly higher in Zone 3 (6.05%). Also, stuck-on calls were
only observed in Zone 3 (0.58%), and a few dropped calls were found almost exclusively in Zone 3 (0.16%). For
Intersector, false calls ranged from 1.4% to 3.56% and missed calls ranged between 0.05% and 0.27%. Stuckon calls ranged from 0.92% for 2.83% and dropped calls were very low (0% and 0.19%).
At the advance zones, at least 91% of detections for Wavetronix and 99% for Intersector were correct. For the
advance zone, a direct comparison of the two systems was not performed because Wavetronix covered all
three lanes combined, but Intersector had one zone covering only the center lane. Wavetronix did not have any
stuck-on or dropped calls, missed calls were 1.07%, and false calls were 8.29% for the summer and fall
datasets combined. Intersector had no dropped calls, 0.04% stuck-on calls (only one call), 0.8% missed calls,
and 0.7% false calls. Additional testing is under way to evaluate the performance of the two systems under
inclement weather conditions.
-
Format:
-
Funding:
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type:
