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September 11, 2021 <br />Page 63 <br />Safety Analysis <br />Safety benefits were estimated based on the reduction in crash severity (type Fatal, A, B, C, or <br />Property Damage) between the programmed and build alternatives. <br />• The analysis used VMT from the Twin Cities Regional Travel Demand Model data for years <br />2019 and 2040. Data between 2010 and 2040 was interpolated based on a linear growth rate. <br />• Crash statistics for different facility types were gathered from MnDOT Toolkit for 2009-2013. <br />This information was used to find a crash rate per million vehicle miles and estimate crash data. <br />• Crash costs for each severity type were valued in accordance with "Recommended standard <br />values for use in B/C analysis in SFY 2021", MnDOT Office of Transportation System <br />Management, July 2020. <br />Remaining Capital Value <br />The remaining capital value of each alternative was subtracted from the initial capital cost to <br />determine the alternative's net capital cost. In determining remaining capital value, the initial costs of <br />the alternatives were separated into the following categories: <br />• Right -of -Way <br />• Major structures <br />• Grading and drainage <br />• Sub -base and base <br />• Surface <br />• Miscellaneous costs — includes mobilization, removal of temporary pavement and drainage, <br />traffic control, project development/delivery, and design and engineering costs. These were <br />assumed to be sunk costs and assigned zero remaining capital value. <br />Maintenance Costs <br />Annual maintenance costs between programmed and build alternatives were monetized based on <br />typical values observed in Minnesota for all facility types. The programmed alternative wouldn't <br />have any maintenance costs for this analysis while the Build alternative with a total roadway length <br />of 24 miles would have an annual Routine maintenance cost of $10,700 per lane -mile according to <br />MnDOT Benefit -cost guidance. These dollar amounts were inflated to year 2019 dollars using an <br />inflation rate of 1.0, which was provided by the Consumer Price Index Inflation Calculator, Bureau <br />of Labor Statistics.3 The maintenance costs were grown linearly from 2028 to 2047. <br />Northwest Metro Mississippi River Crossing Feasibility Analysis <br />