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A four-lane undivided multilane highway (two lanes in each direction) has 3.4 m lanes and 1.5...

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Civil Engineering

A four-lane undivided multilane highway (two lanes in eachdirection) has 3.4 m lanes and 1.5 m shoulders. At one point alongthe highway there is a 4% upgrade that is 1 km long. There are 15access points along this grade. The peak-hour traffic volume has2500 passenger cars and 200 trucks and buses (no recreationalvehicles), and 720 of these vehicles arrive in the most congested15-min period. This traffic stream is primarily commuters. Themeasured free-flow speed is 90 km/h. To improve the level ofservice, the local transportation agency is considering reducingthe number of access points by blocking some driveways andrerouting their traffic. How many of the 15 access points must beblocked to achieve LOS C?

The number of access points that must be blocked is:

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