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III. Environmental Setting, Impacts,and Mitigations <br /> D. Transportation and Circulation <br /> As was the case for analysis of existing conditions,projected turning movement volumes were <br /> adjusted to account for operational characteristics of the high percentage of trucks that have a <br /> greater effect on traffic flow than do passenger cars. Traffic volumes were converted to <br /> passenger-car equivalents(PCE)by equating each truck to two passenger cars. As described in <br /> the Setting,this is a conservative adjustment because the 2.0 PCE adjustment factor is for heavy <br /> trucks,and there is a mix of medium and heavy trucks on study roadways. Under 2005 future <br /> scenario without project conditions,traffic operations for the northbound left turns from Austin <br /> Road to Mariposa Road would deteriorate from LOS A to LOS D during the am. peak hour. <br /> There would be a noticeable increase in delays experienced by drivers wishing to make this <br /> movement,but the level of service would still be no worse than the City of Stockton's minimum <br /> acceptable service level. The westbound left turn from Arch Road to Austin Road would degrade <br /> from LOS A to LOS B,and all other movements at the study intersections would remain at <br /> LOS A. A summary of the existing and 2005 future-without-project levels of service are <br /> presented in Table III.D.4. <br /> TABLE III.D.4: A.M. PEAK-HOUR INTERSECTION LEVELS OF SERVICE(LOS) <br /> UNDER EXISTING AND FUTURE CONDITIONS/a/ <br /> Interse d ' n Future w/o Future with <br /> (Major Street/Minor Street) Existing LOS Project LOS Project LOS <br /> Mariposa Road/Austin Road A/A A/D A/D <br /> Austin Road/Arch Road A/A A/B A/B <br /> French Camp Road/Austin Road A/A A/A A/A <br /> /a/ Level of service determination is for left turns from the major street to the minor street(first <br /> letter), and for the movement from the minor street to the major street with the worst service <br /> level,generally the minor street left turn(second letter). Level of service calculations took <br /> into account the effect of trucks in the traffic stream by applying the Passenger-Car <br /> Equivalents factor of one truck equal to two passenger cars. <br /> SOURCE: Environmental Science Associates, Inc., 1993. <br /> III.D.8 <br />