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as the average crash rate for similar facilities. Segment C had 13 crashes over the five-year <br />period and had a crash rate of 0.87 crashes per million vehicle miles, which is well below the <br />crash rate for similar facilities. Segment D had the fewest crashes, with nine. This segment's <br />crash rate (1.70) is slightly higher than the average (1.25) for similar facilities in Hennepin <br />County. It is important to note that this segment was quite short, approximately seven tenths of a <br />mile. Short segments can show a high crash rate even with a limited number of crashes. <br />Table 6 summarizes the crash rates for the five major intersections along the study corridor. <br />These crash rates were compared to average crash rates obtained from Hennepin County for a <br />variety of intersection types. As shown Table 6, the crash rates for the key intersections are <br />higher than the average crash rate. Because the intersection crash rates were higher than average <br />crash rates, a critical crash rate was calculated. The critical crash rate is an analysis that takes <br />into consideration the randomness of crashes and uses standard deviations to determine if an <br />intersection has a serious crash problem or if it just happens to have an extra crash or two that <br />puts it over the average for the time period that the data was collected. In comparing the <br />intersection crash rate to the critical crash rate, only the intersection of County Road 116 at <br />Dysprosium Street and Thurston Avenue had a crash rate that exceeded the critical crash rate. <br />This intersection is proposed to be modified using safety funds. <br />The following intersection crash rates were used for comparison purposes: <br />• All -way stop control — 0.47 crashes per million entering vehicles <br />• Rural, two-way stop control — 0.59 crashes per million entering vehicles <br />• High volume (>15,000 ADT), high speed (>45 mph), signalized intersection — 0.66 crashes <br />per million entering vehicles <br />Table 6 <br />Intersection Crash Rates <br />Location — <br />County Road 116 and <br />Total Number <br />of Crashes <br />(1996 to 2000) <br />Intersection <br />Crash <br />Rate (1) <br />Average Crash Rate <br />by Intersection <br />Type (2) <br />Critical <br />Crash Rate <br />CSAH 7 (7th Ave.) <br />39 <br />0.93 <br />0.66 <br />1.06 <br />TH 47 <br />29 <br />0.61 <br />0.66 <br />1.04 <br />Dysprosium St. & <br />Thurston Ave. <br />21 <br />1.23 <br />0.59 and 0.47 (3) <br />0.93 <br />CSAH 57 (Sunfish Lake <br />Blvd.) <br />12 <br />0.60 <br />0.47 <br />0.91 <br />County Road 56 (Ramsey <br />Blvd.) <br />11 <br />0.81 <br />0.47 <br />0.97 <br />Crashes per million entering vehicles. <br />Based on data collected by Hennepin County. <br />Average Crash Rate for this intersection reflects the fact that during part of the five-year period the intersection <br />was a two-way stop control and part of the time it was a four-way stop control. <br />SRF Consulting Group, Inc. - 12 - <br />February 2004 <br />