Intersection Sight Distance
Intersection sight distance, abbreviated as ISD, is the corner sight distance available in intersection quadrants that allows a driver approaching an intersection to observe the actions of vehicles on the crossing leg.
Intersection Sight Distance formula
\(\large{ ISD = 1.47 \; V_{major} \; t_g }\) |
Where:
\(\large{ ISD }\) = intersection sight distance
\(\large{ V_{major} }\) = design speed for major road
\(\large{ t_g }\) = gap acceptance time for entering the major road