US US-23 F 3 Flex x Rout ute Co Cost-Bene nefit Stephanie Palmer, P.E. University Region Traffic Safety & Operations Engineer Michigan Department of Transportation
US US-23 F 23 Flex x Rout oute • Located North of Ann Arbor • Recurring Directional Peak Hour Congestion • Non-Recurring Congestion • Incidents • Special events • Interchange and Mainline Operational Issues
Flex R x Rout oute A TM C Com ompone ponent nts • Dynamic Shoulder Use • Dynamic Lane Control • Variable Speed Advisories • Queue Warning
Dyna ynamic S Shoul houlde der
Dynam amic ic L Lan ane U e Use
Var aria iable S Speed eeds
Que ueue ue W Warni ning ng
Perfor ormance M Moni onitor oring ng • MDOT tracking monthly performance measures (started Jan 2018) – Travel times, speeds, planning time index, and crash data – Operation and Maintenance costs – Feedback from agency partners, the public, and emergency responders • Early Results – Improvements in travel time and reliability- especially for southbound US-23 • SB US-23 Planning time improvement over 50% • SB US-23 travel time savings of about 5 minutes • SB US-23 speed increases of around 20 mph • NB US-23 improvements are minimal
US US-23 F 23 Flex x Rout oute Co Costs • Construction of ITS system- $16,000,000 – 30 full gantries, 3 cantilevers over shoulder – Communication and power • Operation of the ITS system- $250,000/year • Maintenance of the ITS system- still determining but estimating at about $300,000/year
Bene nefi fit Cos ost A Ana nalys ysis-TO TOPS Input nputs Benefits Costs • change in capacity- 28% • capital replacement costs (and expected life) • change in speed- 10% • O&M Costs (annual) • reduction in crash rate- 20% • communication costs • reduction in crash duration- 30% • reduction in fuel use- 9% • time device is disseminating useful information – 80% • drivers using information – 80% • time saved by drivers- 2 mins • all other inputs left at default *FHWA Tool for Benefit/Cost – TOPS-BC-Version 1.1 for Hard Shoulder Running
Bene nefi fit Cos ost A Ana nalys ysis Res esult lts TOPS BC TIGER BC $2,300,517 N/A Average Annual Cost (NPV Cost=$20,000,000*) (Construction Cost $20 million, O/M Cost of $200k) Average Annual Benefit $11,645,248.50** Approximately $4 to 6.5 million 7% NPV total Benefit with TIGER $47,439,209 $17,133,402 Grant calculations *Originally underestimated construction cost in TOPS **TOPS model estimated more benefits than TIGER grant methodology
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