MIT1_258JS10_lec02

MIT1_258JS10_lec02 - PUBLIC TRANSPORT MODAL CHARACTERISTICS AND AND ROLES Outline 1 Range of Modes and Services 2 Modal Descriptions 3 Modal

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UBLIC TRANSPORT PUBLIC TRANSPORT MODAL CHARACTERISTICS AND ROLES Outline 1. ange of Modes and Services Range of Modes and Services 2. Modal Descriptions 3. Modal Comparisons and Performance Characteristics 1.258J/11.541J/ESD.226J Nigel Wilson Lecture 2, Spring 2010 1
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Roles for Each Mode Low density flows --------> High density flows Spread O-D flows --------> Concentrated O-D flows Auto-> Car pools -> Van pools Automated guideway subscription bus taxi -> shared ride taxi -> publicos -> fixed bus route -> light rail -> heavy rail 1.258J/11.541J/ESD.226J Nigel Wilson Lecture 2, Spring 2010 2
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Spectrum of Services Increasing vehicle capacity -----> Increasing passenger flows -----> ehicle Vehicle Type Operating Arrangements ar Car an Van inibus Minibus us Bus ight Light Rail eavy Rail Heavy Rail Drivers Free Low Cost High Cost (conventional transit) Low Cost (automated) Right of way Shared Dual Mode Dedicated Routing and Scheduling Flexible Hybrid Fixed 1.258J/11.541J/ESD.226J Nigel Wilson Lecture 2, Spring 2010 3
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Transit Categories (based on Vuchic) 1. Rights of Way Based on degree of segregation Surface with mixed traffic: buses, light rail: with/without preferential treatment Longitudinal separation but at-grade crossing interference: light rail, bus rapid transit -gra levated Full separation: at de, tunnel, e 1.258J/11.541J/ESD.226J Nigel Wilson Lecture 2, Spring 2010 4
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Transit Categories (cont’d) 2. Technologies Key technolo gical characteristics: (a) Support - contact between vehicle and surface rubber tire on concrete steel wheel on steel rail •o t h e r s (b) Guidance - lateral control: steered by driver uided by track guided by track •o t
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ot e s Transit Categories (cont’d) 2. Technologies (cont'd) (c) Propulsion: diesel ICE: conventional or clean CNG electric motor h y b r i d thers (d) Control manual/visual manual/signal automatic:
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Basics of Train Control Tracks are divided into fixed "blocks" (track circuits), ranging from hundreds to thousands of meters in length Max speed in a block is based on track geometry and the location of the preceding train Position of Max Speed (mph) 40 25 10 0 Preceding Train
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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_lec02 - PUBLIC TRANSPORT MODAL CHARACTERISTICS AND AND ROLES Outline 1 Range of Modes and Services 2 Modal Descriptions 3 Modal

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