A long segment of the suburban freeway is to be designed on level terrain. The level...

A long segment of the suburban freeway is to be designed on level terrain. The level segment, however, is followed by a 4.5% grade, 2.0 miles in length. If the DDHV is 2,500 veh/h with 15% trucks (standard mix), how many lanes will be needed on the (a) upgrade, (b) downgrade, (c) level terrain segment to provide for the level of service C? Lane widths and lateral clearances may be assumed to be 12 ft and 6 ft, respectively. Ramp density is expected to be 1.0 ramps/mi. The PHF is 0.92. Good weather, no incidents, no work zones, and regular users of the facility may be assumed.

Expert Solution

Ally Wells answered 11 months ago

Given: - Level terrain - extended freeway segment - Urban area with 0.9 interchanges/km - DDHV...

Given: - Level terrain - extended freeway segment - Urban area with 0.9 interchanges/km - DDHV 4050 vehicles/hour - 10% trucks, no buses, no RVs - PHF 0.95 - Full shoulder and 3.6m wide lanes Determine: - Number of lanes to operate at LOS=C

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9) An existing rural freeway in level terrain is to be analyzed to determine LOS using...

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A freeway is to be designed to provide LOS C for the following conditions: design hourly volume of 5600 veh/h; PHF: 0.92; trucks: 6%; recreational vehicles: 0%; driver population: commuters and familiar drivers; right side lateral clearance: 7ft; rolling terrain; total ramp density of 0.75 ramps per mile. Determine: whether eight (four in each direction) 12 ft lanes are enough to provide LOS C.

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