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7 - Chapter5-Traffic Stream Parameters

# 7 - Chapter5-Traffic Stream Parameters - Traffic Stream...

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Traffic Stream Parameters TTE 4004 9/26/11

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Chapter 5 Traffic stream parameters Traffic flow models Queuing theory Bottlenecks
Introduction Primary function of a highway? Provide mobility Safety – Chapter 3 Level of performance – Chapter 5 Based on traffic flow models and queuing Affected by vehicles per time (flow), variation of flow over time, vehicle types, vehicle speeds

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Traffic Streams Streams of traffic are comprised of individual vehicles, piloted by individual drivers, interacting with each other and the roadway environment (geometry, traffic control devices, etc.).
Traffic Streams Because each driver behaves in a unique way (i.e., has its own brain), it is not possible to describe traffic flow as theoretically concisely as other purely physical phenomena. But we still need quantitative techniques to assess operational measures of highway performance, so we can analyze and evaluate existing transportation facilities, and design improvements for those facilities.

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Traffic Streams Two general types of flow environments: Uninterrupted flow – traffic flow influenced by characteristics of roadway and interactions of vehicles within the traffic stream Interrupted Flow – traffic streams also operate under the influence of traffic control devices
Introduction The three main variables (parameters) that form the underpinning of traffic analysis are: Flow, q Speed, u Density, k

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Flow Definition: The number of vehicles that pass a point on the roadway (sometimes per lane) during a specific time interval. q =
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7 - Chapter5-Traffic Stream Parameters - Traffic Stream...

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