MIT1_258JS10_lec03

# MIT1_258JS10_lec03 - PUBLIC TRANSPORT MODAL CAPACITIES AND...

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PUBLIC TRANSPORT MODAL CAPACITIES AND COSTS Outline 1. Modal Characteristics (cont’d) -- Simple Capacity Analysis 2. World-Wide Status of Urban Rail Systems 3. Capital Costs 4. Operating Costs Nigel Wilson 1 1.258J/11.541J/ESD.226J Spring 2010, Lecture 3

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Simple Capacity Analysis Question: Given a pie-shaped sector corridor serving a CBD served by a single transit line, what will be the peak passenger flow at the CBD? Nigel Wilson 2 1.258J/11.541J/ESD.226J Spring 2010, Lecture 3
Simple Capacity Analysis Then: Population in corridor= = Given: P c = population density at CBD dP = rate of decrease of population density with distance from CBD θ = angle served by corridor r = distance out from CBD L = corridor length t = number of one-way trips per person per day c = share of trips inbound to CB m = transit market share for CBD-bound trips p = share of CBD-bound transit trips in peak hour Nigel Wilson 3 1.258J/11.541J/ESD.226J Spring 2010, Lecture 3

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Simple Capacity Analysis Peak Passenger Flow = Maximum access distance to transit line = L θ /2 Examples: P c dP Lt cm p Req. Capacity Max Access 10,000 800 2 Π /9 10 2.5 0.2 0.5 0.25 10,000 3.5 20,000 1,600 2 Π /9 10 1.5 0.3 0.8 0.25 30,000 3.5 Nigel Wilson 4 1.258J/11.541J/ESD.226J Spring 2010, Lecture 3
Theoretical Capacities Rail: 10 car trains, 200 pass/car, 60,000 pass/hr 2-minute headway Bus: 70 pass/bus, 8,400 pass/hr 30-second headways BRT: 200 pass/bus, 36,000 pass/hr 20 second headways Light rail: 150 pass/car, 18,000 pass/hr 2-car trains, 1-minute headway Nigel Wilson 5 1.258J/11.541J/ESD.226J Spring 2010, Lecture 3

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MBTA Rail Lines Peak Hour Volumes Red Line: Braintree branch 6,100 Ashmont branch 3,700 Cambridge 8,200
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## This note was uploaded on 12/06/2011 for the course ESD 11.380j taught by Professor Fredsalvucci during the Fall '02 term at MIT.

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MIT1_258JS10_lec03 - PUBLIC TRANSPORT MODAL CAPACITIES AND...

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