COMPLIANCE INFO_FINAL INITIAL STUDY/MITIGATED NEGATIVE DECLARATION 5/25

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Mr. Rob Carnachan Page 2 March 6, 2025 Collision History The collision history for the study area was reviewed to determine any trends or patterns that may indicate a safety issue. Collision rates were calculated based on records available from the California Highway Patrol as published in their Statewide Integrated Traffic Records System (SWITRS) reports. The most current five-year period available is July 1, 2019, through June 30, 2024. As presented in Table 1, the calculated collision rates for the study intersections were compared to average collision rates for similar facilities statewide, as indicated in 2022 Collision Data on California State Highways, California Department of Transportation (Caltrans). These average rates statewide are for intersections in the same environment (urban, suburban, or rural), with the same number of approaches (three or four), and the same controls (all-way stop, two-way stop, or traffic signal). The calculated collision rates for the study intersections are less than or equal to the statewide averages for similar facilities, except for East Harney Lane/Clements Road, which is higher than the statewide average. Records at this intersection were further reviewed as detailed below. The collision rate calculations are enclosed. Table 1 – Collision Rates for the Study Intersections Study Intersection Number of Collisions (2019-2024) Calculated Collision Rate (c/mve) Statewide Average Collision Rate (c/mve) 1. E Harney Ln/SR-88 10 0.52 0.74 2. E Harney Ln/Jack Tone Rd 3 0.31 0.59 3. E Harney Ln/Site Access 1 0.29 0.29 4. E Harney Ln/Clements Rd 5 1.25 0.36 Note: c/mve = collisions per million vehicles entering; Bold text = collision rate exceeds statewide average Collision rates for the study segments and comparisons to the statewide averages for similar facilities are indicated in Table 2, with collision rate calculations enclosed. Table 2 – Collision Rates for the Study Segments Study Roadway Segments Number of Collisions (2019-2024) Calculated Collision Rate (c/mvm) Statewide Average Collision Rate (c/mvm) 1. E Harney Ln between SR-99 and SR-88 42 1.19 1.09 2. E Harney Ln between Jack Tone Rd and Site 8 0.78 1.09 3. SR-88 between E Harney Ln and Eight Mile Rd 29 0.62 1.09 Note: c/mvm = collisions per million vehicles miles; Bold text = collision rate exceeds statewide average At the intersection of East Harney Lane/Clements Road there were five reported collisions during the study period, all of which were broadside collisions. Three of the five broadside collisions cited right-of-way violations as the primary collision factor, one to driving under the influence and one to driving on the wrong side of the road. There are no projects identified at this unsignalized intersection in the San Joaquin County Local Roadway Safety Plan (LRSP). However, typical low-cost upgrades at unsignalized intersections mentioned in the LRSP that the County could consider implementing include double stop signs, larger stop signs, traffic islands on stop approaches, and striping stop bars.