HW8 solutions.docx - CAE419 Introduction to Transportation...

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CAE419 Introduction to Transportation Engineering and Design Semester Fall 2015 Homework 8: Public Passenger Transportation 1. Note: The data pertains to a three-hour peak Consider Route AB 1) Peak demand R c =720/3=240 passengers/hr Headway h min =60*C t /R c =60*(50+25)/240=18.75min. use 19 min 2) Cycle time T=2(t 0 +t 1 )=2*(40+15)=110 min 3) Fleet Size N t =T/h min =110/19=5.79, use 6 buses. 4) Revised Cycle Time T’=6*19=114 min 5) Commercial Speed Vc=120*L/T’=120*12/114=12.63 mph Consider Route CD 1) Peak demand R c =600/3=200 passengers/hr Headway h min =60*C t /R c =60*(40+25)/200=19.5min. use 20 min 2) Cycle time T=2(t 0 +t 1 )=2*(40+10)=100 min 3) Fleet Size N t =T/h min =100/20=5, use 5 buses. 4) Revised Cycle Time T’=5*20=100 min 5) Commercial Speed Vc=120*L/T’=120*9/100=10.8 mph 2. q = 0.5 ×VOT ×b OC×c = 0.5 × 15 × 640 80 × 90 60 = 6.32 bus / hr h = 1 q = 0.158 hr = 9.487 min h is less than policy headway. 640 50 = 12.8 bus hr > 6.32 bus / hr Therefore, the optimal frequency is 12.8 bus/hr, and the optimal headway is 60/12.8 = 4.69 min. 3. Deceleration d = 5 ft/sec 2 Safety factor K=1.5
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  • Spring '14
  • ZongzhiLi

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