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.
- See \(\large{ PSD }\) = passing sight distance
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