01342951

Component

https://doi.org/10.3141/2262-05

http://scholar.google.com...rcia&publication_year=2011

Drivers need sufficient passing sight distance (PSD) to pass slower vehicles with safety. This distance can help to improve traffic operation on two-way, two-lane highways. Existing models propose different values of PSD because of different assumptions. In only some cases were these models based on field data of passing maneuvers. This research proposed the design of a methodology to observe passing maneuvers on existing highways with the help of six video cameras installed at a fixed point next to passing sections. The use of more cameras allows complete registration of trajectories along the entire passing zone, with uniform image resolution. The methodology was applied to register a sample of 234 maneuvers on four passing zones. Trajectories of 58 maneuvers were completely described and analyzed with specific restitution software. Results were compared with those from existing PSD models. The distances traveled proposed by the AASHTO model on the left lane were (a) similar to average observed distances when the passed vehicle was one truck and (b) between 50 and 100 m higher when one passenger car was passed. Higher differences, greater than 100 m, were found between measured data and the PSD model (published previously), especially at high design speeds. The observed average speed difference between passing and impeding vehicles was significantly higher than that in any model. Variables with the strongest influence on the time and distance traveled on the opposing lane were the type and speed of the passed vehicle and the length of the passing zone. Left-lane time and distance increase with this length.

01363271

11-1727

English

pp 42-51

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309223003

Print

Figures (5) ; References (19) ; Tables (2)

Mathematical models; Passing; Passing sight distance; Passing zones; Rural highways; Two lane highways; Vehicle trajectories; Video cameras

Video data

Spain

Design; Highways; I20: Design and Planning of Transport Infrastructure

TRIS, TRB

Feb 17 2011 5:54PM

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