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 |
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\(\large{ d_1 = \frac{ t_1 }{ 0.68 } \; \left( \bar {u} \;-\; m \;+\; \frac{ \bar {a} \; t_1 }{ 2 } \right) }\) \(\large{ d_1 = 1.47 \; t_1 \; \left( \bar {u} \;-\; m \;+\; \frac{ \bar {a} \; t_1 }{ 2 } \right) }\) |
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| Symbol | English | Metric |
| \(\large{ d_1 }\) = initial maneuver distance | \(\large{ft}\) | \(\large{m}\) |
| \(\large{ \bar {a} }\) = average acceleration | \(\large{\frac{ft}{sec^2}}\) | \(\large{\frac{m}{s^2}}\) |
| \(\large{ \bar {u} }\) = average speed of passing vehicle | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
| \(\large{ m }\) = difference in speed of passing vehicle and passing vehicle | \(\large{\frac{ft}{sec}}\) | \(\large{\frac{m}{s}}\) |
| \(\large{ t_1 }\) = time of initial maneuver | \(\large{sec}\) | \(\large{s}\) |
Tags: Transportation Equations