trans_sys_chap05

trans_sys_chap05 - Introduction to Transportation Systems 1...

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Introduction to Transportation Systems 1
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PART I: CONTEXT, CONCEPTS AND CHARACTERIZATION 2
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Chapter 5: Networks 3
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Node and Link Network Representation NODES LINKS Figure 5.1 4
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Networks ± Transportation networks are interconnected . ± We have connections between the links through the other basic network elements that are called nodes , which often represent terminals or stations. ± In most transportation cases, the network is redundant . There are usually multiple ways to travel between nodes. 5
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Links ± Links are typically guideways, highways, rail lines, air corridors, etc. ± We have links that can take flows, typically of vehicles, in one or both directions. ± Links often have a capacity (e.g., vehicles/hour). 6
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Capacity Capacity defined as a link volume beyond which the travel time is infinite. Travel Time/Capacity Volume Travel time Capacity Volume Figure 5.2 7
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Another Idea Link Travel Time Volume (vehicles/hour) Figure 5.3 8
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This note was uploaded on 12/06/2011 for the course ESD 1.221j taught by Professor Josephsussman during the Fall '04 term at MIT.

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trans_sys_chap05 - Introduction to Transportation Systems 1...

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