Lab 12 - CE93 - Engineering Data Analysis Prof. Joan...

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CE93 - Engineering Data Analysis Prof. Joan Walker, Spring 2011 1 Lab 12 (April 20, 2011) Based on the relationship between flow and density of the vehicles, traffic states within a freeway section can be classified either as (i) Free flow or (ii) Congested flow where flow is defined as the number of vehicles (n) which pass at a fixed location during a certain time interval (T), (i.e. n/T). Density is defined as the number of vehicles (m) which exist over a certain freeway section of length (L) at a fixed time, (i.e. (m/L)). Flow will increase with the density when vehicles are freely flowing in the freeway section. On the contrary, flow will decrease with density once the freeway section becomes congested (i.e. queued with vehicles), in which case more cars will make a traffic jam worse. Now we are going to examine the flow-density relationship using traffic data measured by inductive loop detectors that are located at D1 as shown in Figure 1. The detectors there provide aggregated vehicle counts and average occupancies (dimensionless measure of density). N 0 .9 m i . 3 D1 Inductive Loop Detector Detector Station Figure 1. Freeway site, at I-5 N, Sacramento, California
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CE93 - Engineering Data Analysis Prof. Joan Walker, Spring 2011 2 Download data.txt in the bSpace (-> Resources -> Labs -> Lab12).The first column of
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This note was uploaded on 06/02/2011 for the course CIV ENG 93 taught by Professor Staff during the Spring '08 term at University of California, Berkeley.

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Lab 12 - CE93 - Engineering Data Analysis Prof. Joan...

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