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<br />the existing and planned systems to be captured in the cost basis. In developing <br />the average costs for the existing versus future system, the following factors <br />were among those considered: <br /> <br />The average number of lanes per mile of arterial and collector street <br /> <br />. <br /> <br />Typical street width <br /> <br />. <br /> <br />The assessable and non-assessable percent of linear street cross- <br />section costs <br /> <br />. <br /> <br />The density of components (e.g., bridges, street lights, traffic signals) per <br />lane mile <br /> <br />Typical features included in streets, given changes in design standards. <br /> <br />1.1.3 Step 2 - Determine System Capacity <br /> <br />Street system capacity is measured by the average number of lane miles per <br />trip. The average lane miles per trip is calculated as follows: <br /> <br />Average Lane Miles Per One-Way Trip = fAveraqe Trip Lenqth in miles fA TL) XO.5) <br />Capacity Per Lane Mile <br /> <br />The system-wide average trip length (A TL) used in the SDC calculation is based <br />on the miles traveled by an average one-way trip on the arterial and collector <br />network in the Eugene Urban Growth Boundary (UGB). This figure is determined <br />by first determining the current or base year average vehicle trip length for all PM <br />peak hour (4-6 p.m.) trips with one trip end in the Eugene UGB on Eugene's <br />arterial and collector streets. The average trip length is divided in half because <br />trips are charged according to Institute of Transportation Engineers' (ITE) trip <br />generation rates which are expressed as trip ends, accounting for both trips <br />entering and leaving a development. The origin of a trip pays for one-half of the <br />A TL while the destination pays for the other half. <br /> <br />Capacity per lane mile is determined by the community's adopted level of service <br />standard. The Eugene-Springfield Metropolitan Area General Plan adopted <br />transportation level of service standard of accepting LOS D but avoiding LOS E <br />correlates to the border between LOS D and E. This defines capacity as the <br />number of vehicles that can be accommodated on a given roadway segment at <br />the border between level of service D and E. <br /> <br />1.1.4 Step 3 - Determine Unit Cost of Capacity <br />The street component unit cost of capacity is calculated as follows: <br />Cost per Trip (Unit cost of Capacity) = <br />A verage Cost Per Lane Mile of Street System (Cost Basis) X <br />A verage Lane Miles Per Trip (Capacity Requirements) <br /> <br />City of Eugene SDC Methodology <br /> <br />Transportation, Page B- 3 <br />