Homework 5

# Homework 5 - CEE 122 Traffic Engineering Spring 2010...

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CEE 122 Traffic Engineering Spring 2010 Homework #5 Due: __________________ 1. A vehicle is known to have skidded on a level surface (asphalt f=0.70) and then on the adjacent gravel shoulder (f=0.45) where it finally came to a halt. The length of the skid mark on the asphalt surface was 130 feet and on the gravel shoulder 30 feet. What was the speed of the vehicle at the beginning of the skid? 2. The driver of a car traveling at an initial speed u 0 applied the brakes abruptly and the vehicle slid to a complete stop at an average deceleration of 8 ft/s 2 . What is the coefficient of friction of the pavement? 3. Assume you are the project manager of a highway project with a design speed of 50 mph over a sustained incline. The grade profile is shown on the back page. This roadway meets all AASHTO volume and LOS criteria for a truck climbing lane. Due to financial constraints, you’ve decided to AVOID the installation of a truck climbing lane by alternating 1% and 4% grades as shown in the given profile. What is the length of the 1% grade between points B and

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Homework 5 - CEE 122 Traffic Engineering Spring 2010...

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