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Alternative 1: Proposed Project All quarry traffic would use Koster Road from the proposed project access to Blewett Road. North of Blewett Road, 90 percent of quarry traffic would use Koster-Road. A small amount of truck traffic (5 percent) would use Blewett Road. The potential for conflicts between vehicles traveling in opposite directions would be increased by the addition of trucks to these roadways. The addition of truck traffic to Koster Road would result in an increased potential for accidents at the intersection with SR 132. Truckers waiting to make a left turn at the stop sign on Koster Road could become impatient and enter the roadway without waiting for a sufficient gap in traffic. The potential safety impacts associated with adding truck traffic to area roadways would be significant. Alternative 2: Proposed Project with Alternate Northern Access Road �J Blewett Road between the proposed project access and Bird Road would carry 85 percent of loaded trucks and 35 percent of unloaded trucks for the proposed quarry. Koster Road would cavy 10 percent of the loaded trucks and 60 percent of the unloaded quarry trucks. The potential for conflicts between vehicles traveling in opposite directions would be increasedby the addition of trucks to these roadways. The potential safety impacts associated with adding truck traffic to area roadways would be significant. The additional truck traffic to Koster Road anticipated under this alternative would not result in a significant increase in the potential for accidents at the intersection with SR 132. Truck traffic that would need to make a left turn onto SR 132 at this intersection would be directed to use Blewett Road to access SR 132 via Bird Road. Alternative 3: Proposed Project with Bird Road Access to New Interchange All quarry trucks would use the Vernalis interchange and the section of relocated Bird Road between the interchange and the project site. The intersection of the southbound 1-5 Vernalis interchange ramps with relocated Bird Road was analyzed as an unsignalized intersection. With stop sign control for the southbound off-ramp at relocated Bird Road, the addition of truck traffic to the ramp would result in an increased potential for accidents under cumulative conditions. Truckers waiting to make a left turn at the stop sign could _ become impatient and enter Bird Road without waiting for a sufficient gap in traffic. The cumulative effects of adding the proposed project traffic to .this intersection would be significant. Alternative 4: No Proiect T No impacts to traffic safety are anticipated under this alternative. Mitigation Measure 4.4-2a (Alternatives 1, 2, and 3): Implement the traffic improvements already identified for Alternatives 1, 2, and 3 in this section. Draft Environmental Impact Report 4-50 ER-96-3