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lights), just east (within 200 feet) of its intersection with Austin <br /> Road. Just west of Austin Road, Mariposa Road traverses an S-curve where <br /> speeds have been posted for 50 miles per hour. However, autos are able <br /> to travel on this curve at 55 to 60 mph. There are no left or right turn <br /> deceleration lanes on the Mariposa Road approaches to Austin Road. <br /> Arcsâ–ş Road. Arch Road is a two-lane, rural roadway which runs east- <br /> west. It runs westerly from Austin Road to an interchange with State <br /> Route 99 near the Stockton Metropolitan Airport. It provides access to <br /> existing and planned industrial development adjacent to its alignment, <br /> and also provides access to two correctional facilities: the Northern <br /> California Youth Center and the Northern California Women's Facility. <br /> Arch Road is STOP sign controlled at Austin Road and has separate left <br /> and right turn lanes at this location. Arch Road has been widened from <br /> its typical two-lane cross section for the first half mile west of Austin <br /> Road (adjacent to the Northern California Women's Facility) to provide <br /> two eastbound lanes, one westbound lane, and westbound left turn lanes at <br /> the two Women's Facility accesses. No other turn lanes are provided <br /> between the SR 99 freeway and the improved roadway section. <br /> Volumes <br /> Weekday PM peak period traffic counts on the roadways adjacent to <br /> the site were conducted in early December 1987. The peak traffic period <br /> of the day was determined to start near 4:00 PM based upon a series of <br /> 24-hour weekday counts conducted on Mariposa Road just west of Austin <br /> Road by the San Joaquin County Public Works Department in June 1985. <br /> Both the hourly variations in volume along Mariposa Road and PM peak hour <br /> turn movement counts at the Mariposa/Austin and Austin/Arch intersections <br /> are shown in Appendix B. <br /> The December 1987 turn counts, which were lower than the June 1985 <br /> midsummer counts, were factored to summer 1988 conditions based upon a <br /> 2.5 percent per year growth rate in the 1985 traffic volumes and <br /> knowledge of turn movement patterns at local intersections. Resultant <br /> summer 1988 volumes are shown in Figure 3.3. These volumes were used in <br /> all traffic analyses. Due to the agricultural nature of the project <br /> vicinity, it can be expected that harvest activity in the summer and fall <br /> 3-23 <br /> I01-32.R3 4/10/89 <br />