Passing Sight Distance
Passing sight distance, abbreviated as PSD, is the total of all four formulas listed below.
Passing Sight Distance formula
\(\large{ PSD = d_1 \;+\; d_2 \;+\; d_3 \;+\; d_4 }\) |
Where:
\(\large{ PSD }\) = passing sight distance
\(\large{ d_1 }\) = initial maneuver distance
\(\large{ d_2 }\) = distance while passing vehicle occupies left lane
\(\large{ d_3 }\) = clearance length
\(\large{ d_4 }\) = distance traversed by opposing vehicle