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turn movements. At the Mariposa/Austin intersection, the lack of an <br /> eastbound right turn and westbound left turn deceleration lane would <br /> require project traffic to slow (and possibly even stop for left turns) <br /> before turning from the high-speed, through travel lanes. This would <br /> disrupt Mariposa Road traffic flow and increase the chances for rear end <br /> accidents. In addition, project trucks turning from Austin Road to <br /> Mariposa Road would also tend to cause ambient traffic to reduce speed <br /> near the intersection while traveling behind the trucks accelerating up <br /> to speed. The slight upgrade on the Austin approach to Mariposa Road <br /> could also increase the time required for truck turn movements (from <br /> Austin) at this location. <br /> There would be similar concerns with truck acceleration and <br /> deceleration at the project access on Austin Road and at the Austin/Arch <br /> intersection although potential safety concerns would be somewhat less <br /> due to the lower ambient volume levels at these locations. <br /> Mitigation Measures. A left turn deceleration lane should be <br /> provided on the westbound Mariposa Road approach to Austin Road. This <br /> potentially may require moving the railroad gate and flashing light <br /> fixtures on the north side of the road to provide enough width at the <br /> crossing for three travel lanes. <br /> A right turn deceleration lane should be provided on the eastbound <br /> Mariposa Road approach to Austin Road. This turn lane would potentially <br /> entail a large fill area due to Mariposa Road being elevated to meet the <br /> level of the railroad crossing. <br /> The site's Austin Road frontage should be widened to its full half <br /> section width. A left turn deceleration lane should be provided on the <br /> southbound approach to the project access and a right turn deceleration <br /> lane should be provided on the northbound approach to the project access. <br /> In addition, a northbound acceleration lane should be provided between <br /> the project access and Mariposa Road (this potentially would be included <br /> within the site frontage widening) . <br /> 3-33 <br /> I01-32.R3 4/10/89 <br />