For the same intersection in Problem 2, left-turning vehicles in the north-bound approach must seek appropriate gaps to cross the through movement. They need 5.5 seconds to cross one through lane, plus 0.5 second for every additional lane, to cross the opposite traffic. As you recall from the class, the intersection sight distance (ISD) is calculated by: ISD = 1.47 x S85 × tgap Do left-turning vehicles have sufficient sight distance to safely cross? You may use the design speed (45 mph) as a proxy for S85. To calculate tgap, there are a total of two lanes in the opposite as shown traffic, in the picture in Problem 2. Safely cross = drivers see at least ISD ahead.

For the same intersection in Problem 2, left-turning vehicles in the north-bound approach must seek appropriate gaps to cross the through movement. They need 5.5 seconds to cross one through lane, plus 0.5 second for every additional lane, to cross the opposite traffic. As you recall from the class, the intersection sight distance (ISD) is calculated by: ISD = 1.47 x S85 × tgap Do left-turning vehicles have sufficient sight distance to safely cross? You may use the design speed (45 mph) as a proxy for S85. To calculate tgap, there are a total of two lanes in the opposite as shown traffic, in the picture in Problem 2. Safely cross = drivers see at least ISD ahead.

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 27P

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