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IntersectionSightDistanceNotes

IntersectionSightDistanceNotes - Intersection Sight...

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Intersection Sight Distance The intersection sight distance must allow drivers to perceive the presence of potentially conflicting vehicles in sufficient time for a motorist to stop, adjust speed, or wait in an effort to avoid colliding in the intersection. The required unobstructed view of the intersection includes an area free of buildings, parked vehicles, highway structures, roadside hardware, hedges, trees, bushes, un-mowed grass or obstructing landscaping features, tall crops, walls, fences, signs, and the terrain itself. Types of Intersection Control: A. No Control B. Stop Control (Minor Stops at Major) B1 Turn Left from Minor Road B2 Turn Right from Minor Road B3 Crossing Maneuver for Minor Road C. Yield control (Minor Yields to Major) C1 Crossing Maneuver for Minor Road C2 Left or Right turn from Minor Road D. Signal Control (All Legs Stop) E. Intersections with all-way stop control F. Left turns from major road
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For Case B (Stop Control where Minor Stops at Major) Must have sufficient clear space for: 1. Left turn vehicle to cross safely 2. Right turn vehicle to accelerate and enter the traffic stream without significantly interfering with vehicles 3. Crossing Maneuver (usually the duration of the right turn movement also permits adequate crossing traffic to complete a successful maneuver). In the following situations, it is advisable to check availability of sight distance for crossing maneuvers: head2right Where left and/or right turns are not permitted and the crossing maneuver is the only legal maneuver; head2right Where the crossing vehicle would cross the equivalent width of more than six lanes; or head2right Where substantial volumes of heavy vehicles cross the highway and steep grades are present (resulting in slow motion of the back portion of the heavy vehicle as it attempts to clear the intersection).
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Departure Sight Triangles A clear line of sight (clear sight triangle) provides sight distance sufficient for a stopped driver on a minor-road approach to depart from the intersection and enter or cross the major road.
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