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d I~ ~THODOLOGIES: City of Eugene Systems Development Charges Appendix C 1~ansportation System Charge Detail ~..0 Collector and Arterial Streets 1.1 Formula The collector and arterial street component is based upon the cost of increasing the vehicular capacity of these streets. Each lane is calculated to provide a certain capacity. Level-of-service 'D', the standard adopted in TransPlan, the area's long- range transportation plan, is used as the basis for the calculation. The cost of increasing capacity is based on the average cost paid by the City for each lane mile of arterial and collector streets. Note that the cost calculation excluded the assessable costs and evaluated only the collector and arterial system. Paragraph 1.3 of this Appendix contains a detailed analysis of the costs used for the collector and arterial component analysis. In this analysis, the impact of new development on the street network was determined by the following formula: ~ Impact Pu =Trips s ~ ~ ~ Length •Ptreent of ?Yips on LotalArtuials and Colketors ost C~tY ~ Where: i 1/2 =The factor used to account for the fact that each trip has an origin and a destination. By applying this factor, costs are equally assigned between the origin and the destination and each development should be responsible for only half of the total impact of each trip. Trips =The number of vehicle trips caused by the development during the hours of peak afternoon traffic (P.M. peak hours). The P.M. peak hour trip rate varies according to land use. Transportation facilities must be built to accommodate the peak demand, thus the use of the P.M. peak hour trip generation rate. Trip rates are to be determined using paragraph 4 of this Appendix C. Trip Length =The average length of vehicle trips. In the Springfield-Eugene ~ metropolitan area the average length of a trip has been calculated to be 4.12 miles. i t F~ebruary'24, 1993 Methodologies: City of Eugene SDCs Page C-1