Initial Maneuver Distance

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 formula

\( d_1 =  ( t_1 \;/\; 0.68 ) \; ( \bar {u} - m + ( \bar {a} \; t_1 \;/\; 2 ) \; )   \)
Symbol English Metric
\( d_1 \) = initial maneuver distance  \(ft\) \(m\)
\( t_1 \) = time of initial maneuver \(sec\) \(s\)
\( \bar {u} \) = average speed of passing vehicle \(ft\;/\;sec\) \(m\;/\;s\)
\( m \) = difference in speed of passing vehicle and passing vehicle \(ft\;/\;sec\) \(m\;/\;s\)
\( \bar {a} \) = average acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)

  

Initial Maneuver Distance formulas

\( d_1 =  1.47 \; t_1 \;  ( \bar {u} - m + ( \bar {a} \; t_1 \;/\; 2 ) \; )   \) 
Symbol English Metric
\( d_1 \) = initial maneuver distance  \(ft\) \(m\)
\( t_1 \) = time of initial maneuver \(sec\) \(s\)
\( \bar {u} \) = average speed of passing vehicle \(ft\;/\;sec\) \(m\;/\;s\)
\( m \) = difference in speed of passing vehicle and passing vehicle \(ft\;/\;sec\) \(m\;/\;s\)
\( \bar {a} \) = average acceleration \(ft\;/\;sec^2\) \(m\;/\;s^2\)

 

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Tags: Transportation Surveying