Intersection Sight Distance

Written by Jerry Ratzlaff on . Posted in Civil Engineering

intersection sight distance 1Intersection 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

\(\large{ ISD =  1.47 \; V_{major} \; t_g   }\)   


 Units English Metric
\(\large{ ISD }\) = intersection sight distance \(\large{ft}\) \(\large{m}\)
\(\large{ V_{major} }\) = design speed for major road \(\large{\frac{ft}{sec}}\) \(\large{\frac{m}{sec}}\)
\(\large{ t_g }\) = gap acceptance time for entering the major road \(\large{sec}\) \(\large{s}\)

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Tags: Equations for Transportation Equations for Surveying