The FHWA/Texas Transportation Institute Test
   
The FHWA/Texas Transportation Institute Test
In 2000 TTI published the test results from a three year study on "Evaluation of Some Existing Technologies for Vehicle Detection, Project Summary Report 1715-S".
   
Conclusion: The RTMS was the most consistently accurate detector tested in these field tests.
   
TECHNOLOGY/
PRODUCT
COST/LANE (b)
OVERHEAD
ACCURACY
(% of ILD)
SIDEFIRE
ACCURACY
(% of ILD)
Inductive Loops
$746
COUNT 98
SPEED 96
COUNT
N/A
SPEED N/A
Active Infrared
$1,293
COUNT 97
SPEED 90
COUNT
N/A
SPEED N/A
Passive Infrared
$443
COUNT 97
SPEED N/A
COUNT
97
SPEED N/A
Radar
$314
COUNT 99
SPEED 98
COUNT
94
SPEED 92
Doppler Micrwave
$659
COUNT 92
SPEED 98
COUNT
N/A
SPEED N/A
Passive Acoustic
$486
COUNT 90
SPEED 55
COUNT
N/A
SPEED N/A
Pulse Ultrasonic
$644
COUNT 98
SPEED N/A
COUNT
98
SPEED N/A
VIDS
$751
COUNT 95
SPEED 87
COUNT
90
SPEED 82
Table 6-2. Quantitative Evaluation of Detectors on Freeways

(a) Six-lane freeway
(b) Includes cost of pole with mast arm for active IR; includes no motorist delay, but does include traffic control costs for ILDs
 
       
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