1. A four-lane freeway (two lanes in each direction) is located on rolling terrain and has 12-ft lanes, no lateral obstructions
within 6 ft of the pavement edges, and there are two ramps within three miles upstream of the segment midpoint and three ramps within three miles downstream of the segment midpoint. A weekday directional peak-hour volume of 1800 vehicles (familiar users) is observed, with 700 arriving in the most congested 15-min period. If a LOS no worse than C is desired, determine the maximum number of heavy vehicles that can be present in the peak-hour traffic stream.
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Answer:
Explanation:
The deceleration of the car on the dry pavement is found by the Newton's Law:
Where:
Likewise, the deceleration of the car on the unpaved shoulder is:
The speed just before the car entered the unpaved shoulder is:
And, the speed just before the pavement skid was begun is: