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7.B Page 4 C��ti��ca�� 4�ibu�ab�� to �ed L�g�t �fiol�fior�� zoo� zaos zoo9 20 (Pre-Redflex) Year 1 Year 2 Year 3 Throu h Au ust 2 Eastbound Whipple Ave. 1 (10 Months � 0 Monitored (Full Year Monitored) Southbound Vete�ans � 2 1 � e�vd 0 Months Monitored 6 Months Monitored Unmonitored Directions 0 1 2 0 Totai Collisions — All 2 5 3 0 Directions These figures indicate a downward trend from the time the system was installed, from five in the first year with only one approach monitored for ten months of the year, down to three in the second year (a full year monitored on the first approach and six months on the second approach), and none reported so far this year. Due to the short time frame the program has been running and the relatively small number of collisions that are being compared, it is difficult to draw too many conclusions as to the effectiveness of the system at actually reducing collisions at this point. This is highlighted by the fact that there were only two collisions attributable to red light violations in 2007 when there were no cameras in place, yet five in 2408 when the first camera went live in March, and none reported so far this year. Claiming the program had reduced collisions to iero would be analogous to claiming a 100% reduction in the homicide rate if the City recorded two in one year followed by one the second year. in raw numbers it would be a 100% reduction, but in reality it is a statistically insignificant sample size. Overall Traffic Safety As discussed above, the Redflex system has had some measurable effect on safety indicators. It has reduced the number of detected red light violators by twenty to thirty percent for both approaches. This is a significant reduction that would not be possible using standard enforcement techniques. Additionally, there has been a decrease in the number of documented collisions attributable specifically to red light violations. Two other factors should be considered when evaluating the impact of the system on safety: '[ ) the overal[ number of collisions that occur within the intersection, regardless of the cause; and 2) any change in the number of injury accidents in the intersection. Year pocumented Documented Undocumented Total In'u Non-ln'u 2007 '[ 7 46 54 2008 2 11 12 25 2009 6 9 22 37 2010 1 3 10 14 Jan - Au Although it is difficult to attribute accident reduction to any single factor, it does appearthat the Redflex program may have had on overall calming effect on the intersection. The 4