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