4_Attachment 1 - Laserfiche WebLink

Analysis of the collision patterns do not indicate that the lane adjustments had an influence on the collisions. Five of the ten collisions were broadside collisions caused by red light violations (four northbound redlight violations and one southbound left turn red light violation). All five of the red light violation crashes involved the northbound through and the southbound left turn. Staff evaluated the visibility of the northbound traffic signal head and while adequate, an additional signal head will be installed on a signal mast arm. Hopyard Road at Owens Drive No patterns were identified looking at the one-year collision history. Staff also evaluated the three-year collision history which included 16 collisions. Five of the 16 collisions were hit object collisions due to driver inattention on various approaches to the intersection. The remaining 11 collisions were a combination of rear end collisions on all four approaches a sideswipe due to improper lane change and two broadsides that involved differing movements. No patterns were identified and no changes are recommended to this intersection at this time. Stanley Boulevard at Valley Avenue / Bernal Avenue. Similar to Foothill Road at Dublin Canyon, the intersection of Stanley Boulevard at Valley Avenue / Bernal Avenue does not normally make the top 10 collision location list. In the previous three-year period there were a total of nine crashes. Six crashes in one year is double the average at this intersection. The six crashes include three rear-end (two eastbound and one southbound to the south of the intersection), two broadsides (both involved the southbound left, one with a northbound through and another with a northbound right) and a hit object DUI. In the first broadside collision, the southbound left ran the red light crashing into a northbound through. In the second broadside collision, the northbound right turn driver fell asleep and ran the red crashing into a southbound left turn. The two eastbound rear end collisions occurred at different times of the day and the driver testimony was that they were not paying attention. No correctable patterns were identified. Valley Avenue at Pleasanton Avenue (roundabout) In the 10 years prior to 2021, there have not been any collisions at this intersection. The five collisions occurring in 2021 are all "hit object" type collisions. Four of the collisions began with a westbound vehicle entering the roundabout. Two of the four hit the center island, the third hit the sidewalk and the fourth also hit the sidewalk and admitted traveling over 50 mph on the roadway. The 5th collision was an eastbound bicycle that was riding too fast around the roundabout and struck the roundabout. The previous 10 years with no collisions indicate that the visibility and warning of the roundabout is adequate. Green street guidance signs are present approaching the roundabouts to provide warning, and staff will evaluate if additional warning can be placed on the approaches. No correctable patterns were identified at the remaining intersections. Page 6 Avenue was not on the list for the first time, with only two collisions last year. Similarly Hopyard Road at Stoneridge Drive also had two crashes. Both of these intersections average 6+ crashes per year historically. The top three intersections are described below as well as any intersections where staff identified patterns/improvements. Foothill Road at Dublin Canyon Road / Canyon Way This is the first time this intersection has been on the top 10 list. The period from 2017 to 2020 the intersection had a total of 9 collisions. Ten collisions in one year is three times the normal rate for this intersection. It should also be noted that this intersection continues to experience lighter than usual traffic with 25,000 vehicles per day compared to the pre-pandemic volume of 45,000 per day. This continued low volume can be attributed to the low ridership on BART and the continued work from home by most of the office building businesses around Stoneridge Mall. The intersection was modified in June of 2020. The southbound alignment was altered slightly to allow the addition of a third southbound left turn lane. Page 5