Decision Sight Distance

Written by Jerry Ratzlaff on . Posted in Civil Engineering

stopping distance 1Decision sight distance, abbreviated as DSD, is the distance required for a driver to detect an unexpected obstacle or problem and react approperately.


Decision Sight Distance formula

\(\large{ DSD =  1.47 \; V \; t   }\)   


\(\large{ DSD }\) = decision sight distance

\(\large{ V }\) = design speed

\(\large{ t }\) = total time for the maneuver (reaction time + maneuver time)


Tags: Equations for Transportation Equations for Surveying