Parameters Affecting Stopping Sight Distance

Research was conducted to evaluate existing stopping sight distance criteria in relation to the current vehicle fleet and driver population. The research findings presented in this report are based on field tests of driver and vehicle performance characteristics and capabilities, and a synthesis of current literature and previous research findings. The general stopping sight distance (SSD) model is examined in relation to the following elements: driver eye height, obstacle height, driver perception-response time, vehicle braking distance, and initial vehicle speed. Studies show that for controlled stops from higher speeds by cars with worn tires on slippery roads the required distances are considerably greater than those allowed in the current SSD model. Comments are also made on SSD requirements for trucks under various conditions, studies of rural sites, and sensitivity analyses involving SSD and geometric design.

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