3. (30 pts) An old urban four-lane freeway has the following characteristics: no

Question

3. (30 pts) An old urban four-lane freeway has the following characteristics: no lateral clearance 590 trucks, no RVs 11 ft lanes an interchange density of 1/mile PHF=0.9 Peak-hour demand 2200 veh/h .rolling terrain · Commuters only a) What is the capacity of this freeway? b) The present peak-hour demand on the facility is 2200 veh/h. What is the present Density and level of service? The anticipated growth in traffic is expected to he 6% per year. To avoid breakdown (LOS F), when (in how many years) will substantial improvements be needed to this facility? c)

Explanation / Answer

Where: V =2200 veh/h (given) PHF = 0.90 (given) N = 2 lanes (given) fHV = 1.0 (no trucks, buses, or RVs in the traffic stream) fp = 1.00 (assumed commuter driver population) Then: 2200 / / ln 0.90*2*1.00*1.00 2200v pc h p

Step 3: Find the Level of Service and the Speed and Density of the Traffic Stream 38.4 / / ln 48 1,842 pc mi S v D p = = = From Table 12.2: the density 38.4 pc/mi/ln fall within the defined boundaries of 35-45 pc/mi/ln for LOS E

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