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A section of a multilane highway is to be reconstructed to improve the level of service....

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Civil Engineering

A section of a multilane highway is to be reconstructed toimprove the level of service. The section being considered is on a5.0% upgrade that is 3/4 mile long. The highway currently has4-lanes (2 in each direction – all are 12-ft lanes) with a two-wayleft-turn lane in the middle and 4 foot shoulders on the rightside. It is to be reconstructed into a 6-lane facility (3-lanes ineach direction) undivided facility but, due to commercialdevelopment surrounding the highway, must remain in the current 72foot right of way. There are currently 35 access points per mileand the free flow speed is determined to be 50 mi/h. It is knownthat the road currently operates at capacity with 420 trucks/buses(no recreational vehicles) during the peak hour, a peak hour factorof 0.95 and all-commuter traffic.

The redesign is to reduce the number of access points per mileto 10 and to reduce the grade to 4.0% for 3/4 mile. It is estimatedthat the new design will increase traffic by 13%.

  1. Determine the lane width and shoulder width combination thatwill maximize capacity given that the 3 lanes (each direction) mustfit within 36ft?
  2. For the maximum-capacity lane/shoulder combination chosenabove, determine the new design's level of service anddensity.

Answer & Explanation Solved by verified expert
3.5 Ratings (399 Votes)
We are given a current design section but dont know the flowrateSo we have to calculate the vpAssume one way flow in the peak hour V vehhourCurrently we haveNumber of lanes in one direction 2 all 12 foot lanesPHF 095Percentage of Trucks Buses PT 420VSince it is 5 upgrade over a 34 length segment we can assumeET 4Percentage of RVs PR 0Roadway is at capacity so LOS E and maximum possible density 28pckmln 45061 pcmilnLets calculate the heavy vehicle factor using the formulafHV andit is calculated using the formulaWe have assume ET 40 and PT 420V and PR 0So fHV 11420V 3 1 1 1260V VV 1260So Calculate vp based on the formulawherevp 15mt passenger car equivalent flow rate in pchlnV hourly volume let this be an unknown valuePHF 095N Number of lanes in one direction    See Answer
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