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3. Trip Cost Allocation <br />To determine the number of traffic trips upon which to allocate the lost interest <br />expenses, County staff subtracted the current 4 -lane capacity of SR60 from the <br />future 6 -lane capacity. For Segment Two, the calculation was straightforward. <br />The existing 4 -lane capacity is 2,000 vehicles per hour (peak hour, peak <br />direction/westbound) and the future 6 -lane capacity is 2,570 vehicles per hour. <br />The difference (2,570 minus 2,000) equals 570 vehicles. Consequently, the lost <br />interest expenses were allocated over 570 westbound vehicles, or trips. <br />The Segment One calculation was more complicated. Because Segment One is <br />presently over -capacity by 104 vehicles per hour, there initially appeared to be <br />fewer vehicles to absorb the lost interest expenses. This was offset however by <br />the lower signal -per -mile ratio on Segment One. The lower signal -per -mile ratio <br />resulted in a higher 6 -lane capacity (2,790 vehicles per hour) for Segment One. <br />After subtracting the existing 4 -lane capacity (2,120 vehicles per hour) and the <br />over -capacity amount (104 vehicles per hour) from the Segment One 6 -lane <br />capacity (2,790 vehicles per hour), the result was 566 vehicles. Consequently, <br />the lost interest expenses for Segment One were allocated over 566 westbound <br />vehicles, or trips. <br />4. SR60 Interest Share Fee Calculation <br />The Table on the following page summarizes the lost interest expenses (Section <br />2 of this Technical Memorandum) and the trip allocation analysis (Section 3) and <br />indicates the interest share fee per trip for both Segment One and Segment Two. <br />SR60 Segment One (66th Avenue to 82nd Avenue) = $7,677 per westbound trip <br />SR60 Segment Two (82nd Avenue to 1-95) = $17,731 per westbound trip <br />4 <br />