Question: A six-lane freeway (three lanes in each direction) in rolling terrain has 11-ft lanes and obstructions 4 ft from the right edge of the traveled

A six-lane freeway (three lanes in each direction) in rolling terrain has 11-ft lanes and obstructions 4 ft from the right edge of the traveled pavement. There are five ramps within three miles upstream of the segment midpoint and four ramps within three miles downstream of the segment midpoint. A directional peak- hour volume of 2000 vehicles (primarily commuters) is observed, with 600 vehicles arriving in the highest 15-min flow rate period. The traffic stream contains 12% large trucks and buses and 6% recreational vehicles. What is the density of the traffic stream (in pc/mi/In)?

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