Initial Maneuver Distance

Initial 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	\(ft\;/\;sec^2\)	\(m\;/\;s^2\)