Authors: S Bassan Published: 05 Jan 2011


The paper reviews the decision sight distance (DSD) highway design practices in several countries and proposes a model that includes a braking component after the pre-manoeuvre process and prior to the manoeuvre operation. The manoeuvre time range depends on the design speed. The braking component of the DSD includes a manoeuvre design velocity, which is smaller than the design speed and a deceleration element which can be adopted from stopping sight distance design characteristics. The DSD length could be applied to traffic control by examining the necessity of advance variable warning signs. The advantage of the recommended procedure is the potential coverage of several decision sight distance situations: non initiative decision of the driver, initiative decision of the driver, and a decision of braking and stopping with utmost comfort.
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