Distance Traversed by Opposing Vehicle

on . Posted in Civil Engineering

sight distance 1Distance traversed by opposing vehicle, abbreviated as \(d_4\), is the distance covered by a vehicle that is moving in the opposite direction to another reference vehicle.  This is used in traffic engineering and road safety to analyze the potential risks and safety conditions on roads.

For example, if you have two vehicles moving towards each other on a road, the distance traversed by the opposing vehicle refers to the distance it covers while approaching the other vehicle.  This is an important consideration for determining safe passing distances, overtaking maneuvers, and collision avoidance.

Traffic engineers, road planners, and safety experts take into account factors like vehicle speeds, road geometry, visibility, and reaction times to calculate appropriate passing zones and safe distances between vehicles.  This helps prevent head-on collisions and other dangerous situations on the road.


distance traversed by opposing vehicle formula

\( d_4 =  2 \; d_2 \;/\; 3   \) 

\( d_2 =  ( 2 \;/\; 3 ) \; d_4   \)

Symbol English Metric
\( d_4 \) = distance traversed by opposing vehicle \(ft\)  \(m\) 
\( d_2 \) = distance while passing vehicle occupies left lane \(ft\) \(m\)


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Tags: Transportation Surveying