2024-019 - Santa Ana Vision Zero Plan

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COLLISION ANALYSIS 3.6 Analysis of Systemic Safety Needs Figures 3-13 through Figure 3-15 show a tree diagram focused on the fatal and serious injury collisions along roadway characteristics throughout Santa Ana. The collision trees suggest that six -lane roads as well as intersections present the greatest risk of collisions. These systemic safety concerns demonstrate that as more lanes exist, so does the chance of a collision resulting in a fatality or serious injury. More lanes typically have more cars and higher speeds, increasing the quantity and severity of collision. 3.7 Collision Summary People biking and walking, especially people with visual impairments or other disabilities, are the most vulnerable roadway users. Though there are more automobile collisions, pedestrian and bicyclist involved collisions are more likely to be involved in serious injury or fatal colli- sions, and they are disproportionately represented in all collisions. Of pedestrian collisions over the past five years, 16% resulted in serious injuries or fatalities and 5.5% for all bicycle collisions, whereas only 2% of automobile collisions resulted in a serious injury or fatality. Figure 3-16 illustrates the Santa Ana corridors with moderately -high to high injuries involving pedestrians, bicyclists, and vehicles. These corri- dors have the highest collision rates and injury severities collision rates and injury severities. Consequently, these have been categorized as safety corridors that merit consideration for measures that can help improve their safety for all. The methodology for this analysis involved joining each collision to the nearest street segment to quantify the number of collisions and severity of injuries that have occurred at different locations along a corridor. Each injury was given a `score' as noted in the list below. Each road segment's score was then summed together for a total score per corridor. A more detailed version of that map that looks at each road segment can be found in Appendix B. Description Pedestrian Fatalities or Severe Injuries 1.5 Bicycle Fatalities or Severe Injuries 1.5 All Other Pedestrian and Bicycle Collisions 1.25 Vehicle Collisions Resulting in Fatalities or Serious Injuries 1.25 All Other Vehicle Collisions 1.0 The goal is to slow travel speeds, redesign streets to accommodate multimodal travel, and reduce traffic fatalities and serious injuries to zero through the recommendations outlined in this Plan. SANTAANA VISION ZERO PLAN 61