Draft Comprehensive Transportation Plan Update_September 25

PROJECT SHEETS

DRAFT

PROJECT SHEET DATA This page outlines further information about the data displayed in the following project sheets. Where applicable the data source, definitions, and process are described. Traffic Volumes (VPD) Traffic volumes for the project sheets were obtained from the regional travel demand model. Volumes for the year 2010 were obtained from the Capital Area Metropolitan Planning Organization’s Triangle Regional Model for the current 2010 base year. Traffic volumes for the year 2040 were obtained from a final run of the CTP network and considers the construction of the proposed project and the returned improvements. Congestion (V/C Ratio) Congestion values for the project sheets were obtained from the regional travel demand model. Congestion values for the year 2010 were obtained from the Capital Area Metropolitan Planning Organization’s Triangle Regional Model for the current 2010 base year. Anticipated congestion for the year 2040 was obtained from a final run of the CTP network and considers the construction of the proposed project and the returned improvements. Congestion is identified by using volume-to- capacity (V/C) ratios. V/C ratios are calculated by dividing the traffic volume of a roadway segment by the theoretical capacity of the roadway. Although V/C can be tied to level of service (LOS), V/C allows for a more specific analysis. The result is a universal quantitative measurement. The table below provides the V/C categories that were used in analyzing corridor improvements. CATEGORY DESCRIPTION Under Capacity V/C < 0.85 A roadway with a V/C less than 0.85 typically operates with efficiency and is not considered congested. Approaching Capacity or At Capacity V/C = 0.85 to 1.0 As the V/C nears 1.0, the roadway is becoming more congested. A roadway approaching congestion may operate effectively during non-peak hours but be congested during peak travel periods. Street Hierarchy The street hierarchy reflects potential changes to the transportation network discussed in Chapter 3. Street hierarchy allows the Town to balance competing interests between design features, travel modes, and available rights-of-way. Definitions of each category are below. FREEWAYS · Controlled access · Multi-lane roadways for higher speeds and longer distance travel · Carry traffic through the Triangle region Functional Classification Freeway & Interstate Local Examples I-40 & NC 540 Number of Lanes 4+ travel lanes Above Capacity V/C > 1.0 Roadways operating at capacity or slightly above capacity are heavily congested during peak periods and moderately congested during non-peak periods. A change in capacity due to incidents greatly impacts the travel flow on corridors operating within this V/C range.

Partial or full access control, exclusive to motorized vehicular travel

Other Considerations

B-i | P A G E

September 25, 2017 Draft