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would generate truck trips similar to the existing operation, would result in intersection and roadway conditions similar to existing conditions. Existing Without Project Conditions In an attempt to determine the portion of intersection capacity currently used by quarry related traffic, the truck trips associated with the existing operation were subtracted from the existing traffic volumes. The product of this analysis would be equivalent to conditions without the proposed project traffic volumes. The quarry operation currently generates, and if approved, the proposed project would continue to generate about 4 truck trips during each of the a.m. and p.m. peak hours. The existing intersection LOS without project traffic conditions is shown in Table 3.4-2. It can be seen that the project does not have any significant impact on the LOS of the analyzed intersections and therefore the project would not significantly impact any other intersections of concern in the project area. It can be assumed that the LOS for roadway segments in the project area would be higher than for its associated intersections because intersection LOS is governed by both traffic volume and turn movements, whereas road segment LOS is directly related to traffic volume. It should be noted, however, that even though the project traffic would not degrade the LOSs at the analyzed intersections, the truck traffic generated by the project would have a negative impact on the traffic flow on the surrounding roadways. As noted in the Highway Capacity Manual, heavy vehicles adversely impact traffic in two critical ways: (1) They are larger than passenger cars and, therefore, occupy more roadway space than passenger cars; and (2) They have poorer operating capacities than passenger cars, particularly with respect to acceleration, deceleration, and the ability to maintain speed on upgrades. These factors particularly effect two-lane highways where passing must be accomplished using the opposing travel lane. The roadways surrounding the project site, including State Route 88, are all two-lane roadways which would have reduced capacities with any increase in truck volume. However, since the project generates only about 4 trips per hour, it has minimal impact on the capacity of the surrounding roadways. 67