How Many Seconds Ahead Should Sufficient Sight Distance Allow Us to See the Road Conditions?

1 Answers
DelDavid
07/30/25 2:52am
Sufficient sight distance requires visibility of road conditions at least 15 seconds ahead. Below is an introduction to sight distance-related content: 1. Stopping Sight Distance: The minimum distance required for a vehicle to come to a safe stop from the moment the driver sees an obstacle ahead until reaching it. 2. Meeting Sight Distance: On the same lane, when two opposing vehicles meet, the minimum distance required from the moment they spot each other until both apply brakes to come to a safe stop simultaneously. 3. Passing Sight Distance: On a two-lane road without clearly marked lane lines, the minimum distance required for two opposing vehicles to safely pass each other after spotting one another and taking deceleration and avoidance measures.
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