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Agenda - 10-02-2012 - 7d
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Agenda - 10-02-2012 - 7d
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10/13/2015 10:44:10 AM
Creation date
9/28/2012 3:08:37 PM
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BOCC
Date
10/2/2012
Meeting Type
Regular Meeting
Document Type
Agenda
Agenda Item
7d
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Minutes 10-02-2012
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\Board of County Commissioners\Minutes - Approved\2010's\2012
RES-2012-087 Resolution - Comments to the DCHC Metropolitan Planning Organization Transportation Advisory Committee re 2040 Metropolitan and Comprehensive Transportation Plan
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\Board of County Commissioners\Resolutions\2010-2019\2012
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73 <br /> 2040 MTP and CTP <br /> Alternatives — Congestion Maps (v/C maps) <br /> Use of Congestion Maps <br /> The Performance Measures provide a eg neral indicator of the overall transportation <br /> system. On the other hand, the Congestion Maps show the forecasted level of service on <br /> specific road segments based on the average of the four-hour afternoon peak hour. These <br /> maps are sometimes called"V/C" maps (V over C maps)because the level of service, or <br /> existence of congestion, is derived by dividing the traffic volume by the traffic capacity <br /> of the road segment. For example, a volume of 9,000 vehicles on a road that is capable <br /> of carrying 10,000 vehicles will produce a V/C of 0.9. A V/C of 1.0 is equal to a Level <br /> of Service (LOS) of"E", which can be described as: <br /> Limit of acceptable delay, unstable flow, poor signal progression, <br /> traffic near roadway capacity, frequent cycle failures. <br /> It should be noted that these congestion maps show the average for the afternoon peak. <br /> The total volume for the four-hour afternoon peak period is divided by the total capacity <br /> for the same period. Thus, the V/C ratio for the afternoon peak is likely to be less than <br /> the one-hour peak, or peak-of-the-peak, often experienced by motorists. <br /> Although the term traffic congestion is subj ective in that it means different levels of delay <br /> to different people, it can be said that any road segment approaching a V/C of 1.0, which <br /> is indicated on the maps with an ��°, experiences some delays. A V/C greater <br /> than 1.0, which is indicated on the maps by the nN�����:� �a��➢l��nN�, means frequent delays for the <br /> motorist and as the V/C approaches a value of 1.1 most motorists experience what might <br /> be termed unacceptable travel delays. <br /> The Triangle Regional Model (the travel demand model for the Triangle Region)uses <br /> travel behavior data for the Triangle Region, future transportation system networks, and <br /> future population and employment data, to forecast the volume and capacity values <br /> needed to produce these maps. The forecasts are for the year 2040. Each congestion map <br /> represents one of the Alternatives, which are comprised of a specific transportation <br /> network and land use scenario. <br /> Review and comparison of the congestion maps for the various Alternatives will show <br /> how well a particular Alternative addresses travel demand on the key roadway segments <br /> and corridors in the MPO planning area. <br /> Of particular importance is the comparison of any one Alternative with the E+C map <br /> (Existing plus Committed), which can be considered a benchmark The E+C map uses a <br /> transportation network with the current roadways and transit services plus any others that <br /> have been committed to being implemented, and the Socioeconomic Data (i.e., <br /> population and employment)for the year 2040. This map shows the level of service to be <br /> Congestion Maps 5-1 <br />
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