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51 <br /> 2040 MTP and CTP <br /> Alternatives —Isochrones <br /> Purpose of Isochrone Maps <br /> Isochrone travel maps connect the points that have the same travel time from a specified <br /> center. They resemble contour maps. They are useful for illustrating the mobility from a <br /> specified center and for showing the labor, retail, residential and other markets in terms <br /> of travel time. These maps are based the average travel time for the afternoon peak <br /> period, which occurs from 3:30pm to 7:30pm. The four specified locations and <br /> presentation order are: <br /> • Downtown Durham <br /> • Carrboro/Chapel Hill <br /> • Research Triangle Park, and <br /> • Downtown Raleigh <br /> These centers attract a significant portion of the travel demand in the region. Therefore, <br /> it is important to understand the impact that each Alternative has on the travel markets for <br /> these centers. <br /> Presentation of Travel Time Measure <br /> This section presents the set of four Isochrone maps by Alternative in the following <br /> order: <br /> • E+C <br /> • Highway Intensive/CommPlan <br /> • Moderate/CommPlan <br /> • Moderate/All-in-Transit <br /> • Transit Intensive/CommPlan (will be added by 8/24/12) <br /> • Transit Intensive/All-in-Transit <br /> Isochrones 4-1 <br />