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Show features community and site design. Table 4, continued * plausible but unlikely. A "heavy lift" relative to rate and location of growth. ** plausible, with a good chance of implementation if transportation policy remains progressive. *** the growth and development scenario will create a strong interest and demand for the initiative and provide the political and financial clout to make implementation quite possible, even probable. **** implementation very likely because the initiative is part of the package of actions that would be necessary to achieve the growth scenario. System Performance Each of the four growth scenarios will have different impacts on the Capital Region's transportation system. The CDTC New Visions Plan evaluates the impacts of transportation investments using multiple performance measures including congestion; accessibility; transit, pedestrian, and bicycle access; arterial function; environmental impacts; travel flexibility and reliability; quality of life; economic impacts; and others. This section will assess the performance of the transportation system under the different growth scenarios. Quantitative measures have been developed, but in many cases where more detailed analysis is beyond the scope of this study, qualitative descriptions are useful for describing real impacts of the scenarios. The CDTC STEP Model was run in the year 2030 for each of the four scenarios. Trip generation was calculated for each scenario using the estimates of household growth by 950 traffic analysis zone developed by CDRPC. Higher transit ridership and a higher number of trips by walking were assumed under the two concentrated scenarios. The CDTC gravity model is used to predict origins and destinations for all vehicle trips in the PM peak hour, including work trips, shopping trips, and other trips. The model calculates the best path for each trip along the network, after considering the impacts of traffic congestion and delay, and then estimates traffic volumes for each link of the network. The results are summarized in Table 5. Table 5 Population, Households, Vehicle Miles of Travel, Vehicle Hours of Travel Time, Vehicle Operating Costs, Excess Vehicle Hours of Delay and Average Speed, 1/7/2010 Effects of Alternative Development Sc… cdtcmpo.org/policy/june07/wa-doc.htm 54/60 |
