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<br />3.1 <br /> <br />3.2 <br /> <br />and the Har Mar crossover. Approximately ISo!c, of the applicable <br />aecident reports concur with that opinion. This location would not <br />have been observable during the field observations. <br /> <br />Another correlation could be found relating to red lighting running. <br />A significant amount of red light running was observed; however, <br />few conllicts were produced as a result. Nevertheless, this red light <br />running can lead to rear end collisions. <br /> <br />. Another relationship was found along County Road B with left- <br />turn type conllicts and similar collisions. <br /> <br />. Vehicles exiting frontage road west of Snelling Avenue were <br />involved in collisions and many conflicts with eastbound vehicles <br />in the right through lane of County Road B. As mentioned in <br />Deficiency No. 12, conflicts and collisions along southbound <br />Snelling A venue could be attributed to vehicles traveling at speeds <br />above the SO-mph speed limit. <br /> <br />Additional analysis tools used with the results of the conflict <br />observation include those described in the Traffic Conflict Procedure <br />Manual. These tools are used to provide supporting evidence to the <br />collision data analysis, as well as a means to assess the relative <br />magnitude of the intersection's deficiencies. <br /> <br />Distribution by Type <br />A bar chart was created sorting the observed conllicts by categories <br />similar to the method typically used to categorize collisions. A <br />diagram of conflict types taken from the Traffic Confliet Procedure <br />Manual and this ba.r chart are shown in Figures 3A and 38. From the <br />bar chart, it can be seen that approximately 40% of all observed <br />conflicts consisted of rear end and weaving types. This is consistent <br />with conflicts and collisions typicall y found at signalized intersections <br />with multiple approach lanes. Other connict types that occurred with <br />some frequency were right turn and left turn opposing types. Right <br />turn conllicts can typically be attributed to access points located near <br />the intersection. Left turn opposing type conflicts can be associated <br />with permissive left turn phasing. This intersection exhibits each of <br />these characteristics. However, the deficiencies found at this <br />intersection have magnified these typical safety problems. <br /> <br />Spatial Distribution <br /> <br />This analysis tool specified that a conflict diagram be created. As <br />previously mentioned, this diagram is shown in Figure 4. A connict <br />diagram is used to complement a collision diagram. Collision diagrams <br />can contain inconsistent information, and the spatial distribution of the <br />collisions is generally imprecise. The conflict diagram can be used to <br />more accurately pinpoint where the operational failures of thc <br /> <br />T raftic Conflict Study <br />Roseville, Minnesota <br /> <br />A-ROSEV0001.00 <br />Page 6 <br />