TY  - JOUR
PY  - 2016//
TI  - Effectiveness of trigger speed of vehicle-activated signs on mean and standard deviation of speed
JO  - Journal of transportation safety and security
A1  - Jomaa, Diala
A1  - Dougherty, Mark
A1  - Yella, Siril
A1  - Edvardsson, Karin
SP  - 293
EP  - 309
VL  - 8
IS  - 4
N2  - Excessive or inappropriate speeds are a key factor in traffic fatalities and crashes. Vehicle-activated signs (VASs) are therefore being extensively used to reduce speeding to increase traffic safety. A VAS is triggered by an individual vehicle when the driver exceeds a speed threshold, otherwise known as trigger speed (TS). The TS is usually set to a constant, normally proportional to the speed limit on the particular segment of road. Decisions concerning the TS largely depend on the local traffic authorities. The primary objective of this article is to help authorities determine the TS that gives an optimal effect on the Mean and Standard Deviation of speed. The data were systematically collected using radar technology whilst varying the TS. The results show that when the applied TS was set near the speed limit, the standard deviation was high. However, the Standard Deviation decreased substantially when the threshold was set to the 85th percentile. This decrease occurred without a significant increase in the mean speed. It is concluded that the optimal threshold speed should approximate the 85th percentile, though VASs should ideally be individually calibrated to the traffic conditions at each site.<p />  <p>Language: en</p>
LA  - en
SN  - 1943-9962
UR  - http://dx.doi.org/10.1080/19439962.2014.976690
ID  - ref1
ER  -