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7. Updated Recommended Improvement Plan TRANSPORTATION OEMAND MANAGEMENT (JDM) While the TVfC supports TDM measures, it does not want to base the Plan on unrealistic TDM goals that are supported by feasible programs. Through the plan process, the Bay Area Air Quality Management District (BAAQMD)-mandated average vehicle ridership (AVR) of 1.35 was tested. This applies to employers with 100 or more employees. The TVTC estimated that such large employers make up only about 10 percent of all employ. ment. This, coupled with the fact that commute trips make up abom 35 percent to 40 per- cent of the PM peak-hour traffic stream, means that the BAAQMD mandate will have neg. ligible impact on traffic levels. The TVTe also investigated the impact of achieving an A VR of 1.35 for all employers, throughout the Bay Area, large and small. Compared to the "ambient" AVR of 1.10-1.15, this would be a 20 percent improvement. Given the commute trip proportion of total p~ peak-hour traffic, a 20 percent increase in A VR would translate into seven percent to eight percent less traffic on the roads. While this would create a significant improvement in op- erations, it would not significantly reduce the need for road building. Nevertheless, if at least a 10 percent increase in A VR were not achieved, additional intersection improve- ments, beyond what are included in the plan, would probably be necessary. The achievement of a 20 percent increase in A VR would not be easy. The TVTC believes that this would require a significant increase in the cost of solo commuting. 111e TVTC, however, is not in favor of parking charges. Gasoline rax increases would be more accept- able, provided they were levied region-wide (including San Joaquin County). Gas tax in- creases would encourage commute alternatives and would provide more money for trans- portation improvements. The Plan is based on a more-achievable goal of an average 10 percent increase in AVR for all employers. This increase would be realized through the adoption and enforcement of local trip reduction ordinances. The 10 percent increase in AVR will bring some of the in- tersections otherwise projected to be borderline unacceptable hack into compliance with the TSOs, Road Improvement Plan The TVTPjAP includes many road improvement projects. These projects were developed by the member jurisdictions of the TVTC. Projects range from intersection modifications to freeway improvements and. new roads. The resulting system would provide good circula- tion within the Tri-Valley. Figure 7-1 shows the planned roadway system. Figure 5-2 in Chapter 5 shows the planned changes to freeway interchanges. Details on planned inter- section lane configurations are included in the Technical Appendix. A detailed listing of the planned roadway improvements is shown in Table 7-1. 18 April 2000 Page 25 .