01518913

Component

https://doi.org/10.3141/2460-11

Traffic operation on entrance speed change lanes (SCLs) is more complicated than on exit SCLs as vehicles interact constantly while merging from the SCL to the freeway. An adequate SCL length gives road users sufficient time to accelerate and to search for a gap so that they can comfortably merge onto the freeway. This study focused on analyzing entrance SCLs from a safety point of view in a probabilistic framework. Sixteen entrance-limited-type SCLs along Highway 417 were considered to investigate the link between the probabilistic measure, probability of noncompliance (Pnc), and collision frequency. Regression analysis was conducted to quantify the effect of the geometry of the SCL, driver merging behavior along the SCL, road users’ exposure, and Pnc on collision occurrence. The model containing Pnc outperformed other models, and the inclusion of Pnc in the regression models resulted in significant improvement in the model fit. The study provided positive evidence on the validity of Pnc as a surrogate measure of safety.

01559855

14-3236

English

pp 97–106

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309295529

Print

Figures (2) ; References (21) ; Tables (3)

Crash rates; Highway design; Highway safety; Merging area; Merging traffic; On ramps; Probability; Regression analysis; Speed change lanes

Ottawa (Canada)

Data and Information Technology; Design; Highways; Planning and Forecasting; Safety and Human Factors; I80: Accident Studies

TRIS, TRB, ATRI

Jan 27 2014 3:07PM

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