I-66 Multimodal Study Final Report - Virginia Department of ...

Multimodal PackagesTable 3.18 TDM Strategy Evaluation ParametersValue Description Source209,596 Total employment in corridor – 2040 Study data136,898 Total office employment in corridor – 2040 Study data16.3 Average vehicle-trip length (work) MWCOG 2010 SOC Report1.20 Vanpool Circuitry Factor Professional judgmentAverage Vehicle Occupancies1.1 Commuting – personal vehicle2.5 a Carpoolers MWCOG 2010 SOC Report (page 64)9.9 Vanpoolers MWCOG 2010 SOC Report (page 64)Prior Drive-Alone Mode Share53% All workers MWCOG 2010 SOC Report (page 65)52% Carpoolers/Vanpoolers MWCOG 2010 SOC Report (page 65)70% Transit riders MWCOG 2010 SOC Report (page 65)53% Telecommuters MWCOG 2010 SOC Report (page 65)a It is possible that average carpool occupancy will increase as a result of conversion of I-66 to HOV-3 status;however, the regional average of 2.5 is already high for carpool occupancy (compared to the national average of2.2 to 2.3) and many carpools are likely to continue to be two-person.Table 3.19 summarizes the results for each strategy, and Appendix D provides more detaileddocumentation of the assumptions underlying these results. Incremental costs and impacts areexpressed as values in addition to costs and impacts for strategy implementation as described inthe I-66 Transit/TDM Study. Cost-effectiveness is shown in terms of dollars per vehicle-tripreduced, based on two vehicle-trips per day and 250 work days per year. Benefits of dynamicridesharing are not estimated because this is an emerging strategy without any good data tosupport an estimate of its effectiveness in 2040. Since benefits cannot be estimated, costs fordynamic ridesharing programs also are not included in the total shown in this table.I-66 Multimodal Study 3-73