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-- Recommended Improvement Plan <br /> <br /> 1-580 West. This section between Tri-Valley and Castre Valley has a projected <br /> demand of 10,300 vehicles eastbound in the PM peak hour. Widening beyond the <br />-- current four lanes is infeasible. <br /> <br /> 1-580 East (Altamont Pass): Alameda County policy, in recognition of the need to <br />--- encourage shorter commuter and not overload Tri-Valley roads with regional <br /> traffic, opposes increases to capacity for single-occupant vehicles. Therefore, <br /> gateway constraint is warranted. The plan includes HOV lanes, as a second <br /> priority project, in recognition of the importance of 1-580 as a regional facility (see <br /> Chapter 7). The gateway constraint policy also applies to Patterson Road, Tesla <br /> Road, and Old Altamont Road. <br /> <br /> Crow Canyon Road (to Castro Valley). Safety improvements are planned for this <br /> section of Crow Canyon Road. However, the TVTC supports maintaining the two- <br /> lane cross-section. <br /> <br /> Vasco Road. Vasco Road is planned for implementation as a two-lane road. <br /> However, the two-lane road project should be done in such a manner to not <br /> preclude future accommodation of public transit or other improvements as subse- <br /> quently determined appropriate. <br /> <br /> The Plan is based upon the following set of assumptions regarding gateway capacity <br /> on the freeways and major arterials which access the Tri-Valley: <br /> <br />- · 1-680 to the north. Six lanes plus' HOV lanes. <br /> · 1-580. Eight lanes. <br /> · 1-680 to the south. Six lanes plus HOV lanes. <br /> · Crow Canyon Road to Castro Valley. Two lanes. <br /> · Vasco Road north of 1-580. Two lanes. <br /> <br /> Any departure from these assumptions would required ~mending the Plan. <br /> <br />__ The TVTP/AP, by incorporating a gateway constraint methodology, is breaking new <br /> ground. Action Plans being prepared for adjacent subareas in Contra Costa County <br /> have not employed this methodology. Consequently, the use of the gateway constraint <br /> methodology could raise a consistency issue between the TVTP/AP and adjacent Action <br /> Plans in Central, East, and Southwest Contra Costa County. Furthermore, no formal- <br /> ized approach for conducting the gateway constraint method of analysis has been <br /> adopted by either the Alameda or Contra Costa CMAs. The Contra Costa Transporta- <br /> tion Authority's Technical Procedures is reticent on the gateway constraint <br /> methodology. <br /> <br /> " Current gateways are established by two factors: geographic constraints and financial <br /> constraints. To some degree the geographic constraints can be overcome through <br /> significant capital investments in new highway projects. However, the Tri-Valley <br /> Transportation Plan is based upon the assumption that significant capacity enhance- <br /> <br />' Barton-Aschman Associates, Inc. 124 <br /> <br /> <br />