Decision Sight Distance
Decision 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
\(\large{ DSD = 1.47 \; V \; t }\) |
Where:
\(\large{ DSD }\) = decision sight distance
\(\large{ V }\) = design speed
\(\large{ t }\) = total time for the maneuver (reaction time + maneuver time)