The types of sight distance considered in highway design are:
Choose the correct answer
Only SSD
SSD, OSD (overtaking sight distance), and ISD (intermediate sight distance)
Only ISD and SSD
Night visibility and day visibility only
Correct Answer
B. SSD, OSD (overtaking sight distance), and ISD (intermediate sight distance)
Why is this the answer?
Three sight distances: SSD (Stopping Sight Distance) — minimum, needed to stop safely; OSD (Overtaking/Passing Sight Distance) — for safe overtaking; ISD (Intermediate Sight Distance) = 2× SSD — when OSD is not feasible; SSD governs crest vertical curves, OSD governs upgrades. All computed for eye height 1.2 m, object 0.15–0.60 m.
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