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<br />intersection are located. For instance, many of the weaving and rear <br />end conflicts were found along the southbound approach to the <br />intersection. These were mainly due to traffic exiting the ramp from <br />Highway 36 and merging across Snelling Avenue. The right turn <br />conflicts were located in one of three areas: the frontage road access at <br />the northeast corner of the intersection, the frontage road access at the <br />southwest corner of the interseetion, and the Conoco access closest to <br />Snelling Avenue on the northwest corner of the intersection. Many of <br />the left turn opposing conflicts were associated with left turning <br />County Road B vehicles attempting to complete their turn at the end of <br />the permissive phase. <br /> <br />3,3 Average Hourly Conflicts (AHC) <br /> <br />The AHC is a measure relating the number of observed conflicts to the <br />number of hours of observation. In this study. the intersection was <br />observed for eight hours. According to the Traffic Conflict Procedure <br />Manual, similar studies have yielded a mean AHC of 2.3 conflicts per <br />hour (75 studies; there is no mention of the type of traffic control <br />eneountered during these studies). As shown in Figure 5, the <br />intersection of Snelling A venue and County Road B had an AHC <br />value of 15.0. As shown in Figure 10, the intersection falls in the top <br />I % of AHC scores from previous studies. <br /> <br />3.4 Average Hourly Conflicts per Thousand Entering Vehicles <br />(AHCfTEV) <br /> <br />This measure normalizes the AHC with respect to volume and is. <br />therefore, a more useful gauge to the conflict severity at an <br />intersection. According the past studies, the average AHCrrEV was <br />found to be 1.4 conflicts per 1,000 entering vehicles. An AHCrrEV of <br />3.3 was found at the intersection of Snelling Avenue and County Road <br />B, whieh signifies that vehicles entering this intersection are subjected <br />to a relatively higher than average conflict exposure. As shown in <br />Figure 10, this intersection's AHCrrEV value is in the top 15(1(: of <br />previous studies. Results showing the AHCrrEV values can be found <br />in Figure 6. <br /> <br />3.5 <br /> <br />Average Conflict Severity by Type (ACS) <br /> <br />The observed conflicts were sorted by type, and the average score of <br />each conflict type was found. These values help determine the relative <br />severity of each observed conflict type independent of frequency. At <br />the intersection of Snelling A venue and County Road B, the <br />predominant conflict types were rear end (ACS = 3.5), weaving (ACS <br />= 3.5), right turn (ACS = 3.7) and left turn opposing (ACS = 3.7). A <br />maximum value of 6 and a minimum value of 2 are possible. An ACS <br />of 4 or more indicates a potentially higher collision risk at the <br />intersection. Results of the ACS analysis can be found in Figure 7. <br /> <br />T ralfie Conflict Study <br />Roseville, Minnesota <br /> <br />A-ROSEV0001.00 <br />Page 7 <br />