Overtaking sight distance (OSD) on a two-lane, two-way highway is considerably larger than SSD because the driver must see:
Choose the correct answer
Only the vehicle ahead
Oncoming traffic over the full overtaking maneuver distance, which involves 4 sub-distances (d1 to d4)
The road surface only
Only 100 m ahead
Correct Answer
B. Oncoming traffic over the full overtaking maneuver distance, which involves 4 sub-distances (d1 to d4)
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OSD = d1 + d2 + d3 + d4 (IRC), where d1 = distance during reaction time, d2 = distance traveled by overtaking vehicle during actual overtaking, d3 = safety clearance with oncoming vehicle, d4 = distance traveled by oncoming vehicle during the maneuver.
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