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III. Environmental Setting, Impacts,and Mitigations D. Transportation and Circulation the accuracy of the Caltrans accident data is limited to the reporting levels of the law enforcement agencies providing accident reports. Caltrans estimates that it receives reports on 100 percent of all fatal accidents,90 percent of injury accidents,and 40 percent of property- damage-only accidents occurring on State highways. On Austin Road,between Mariposa Road and French Camp Road,nine accidents were recorded during 1990 through 1992 for a three-year average of three accidents per year. This 5.5-mile roadway segment,with 2.21 accidents per MVMT,exhibits an accident rate lower than the statewide average of 2.51 accidents per MVMT. On Mariposa Road,between Austin Road and SR 99, 12 accidents were recorded during 1990 through 1992,with one fatality,for a three year average of four accidents per year. This three-mile roadway segment,with 0.50 accidents per MVMT,exhibits a considerably lower accident rate than the statewide average. On French Camp Road,between Austin Road and SR 99, 15 accidents were recorded during 1990 through 1992,with one fatality,for a three year average of five accidents per year. This two-mile roadway segment,with 2.36 accidents per MVMT,exhibits a lower accident rate than the statewide average. IMPACTS AND MITIGATION MEASURES ,Significance Standard According to CEQA standards,a project that would cause an increase in traffic that is substantial in relation to the existing traffic load and capacity of the street system is considered to have a significant adverse impact on the environment. The minimum acceptable level of service in areas of San Joaquin County outside of a City's sphere of influence is LOS C. Because the study intersections and roadways are within the City of Stockton's sphere of influence,however,the City's level of service objective of LOS D was used to identify significant adverse impacts. For purposes of this EIR,a substantial degradation of the pavement quality or a substantial increase in roadway maintenance services demand was considered to cause a significant impact. Also,if travel on project area roadways were made less safe because of the project,the project impact would be considered to be significant. HI.D.6