Initial Maneuver Distance

Written by Jerry Ratzlaff on . Posted in Civil Engineering

sight distance 1Initial maneuver distance, abbreviated as \(d_1\), is the distance traversed during the perception and reaction time and during the initial acceleration to the point of encroachment on the left lane.

 

Initial Maneuver Distance formulas

\(\large{ d_1 =  \frac{ t_1  }{ 0.68 } \; \left(  \bar {u} \;-\; m \;+\; \frac{ \bar {a} \; t_1 }{ 2 }  \right)   }\)   
\(\large{ d_1 =  1.47 \; t_1 \; \left(  \bar {u} \;-\; m \;+\; \frac{ \bar {a} \; t_1 }{ 2 }  \right)   }\)  

Where:

\(\large{ d_1 }\) = initial maneuver distance

\(\large{ \bar {a} }\) = average acceleration

\(\large{ \bar {u} }\) = average speed of passing vehicle

\(\large{ m }\) = difference in speed of passing vehicle and passing vehicle

\(\large{ t_1 }\) = time of initial maneuver

 

Tags: Equations for Transportation