Highway 61 / CSAH 4 Intersection Improvement
Project - 2013
Marc Briese, P.E., PTOEHugo City Council, May 21, 2012
Thru-stop Each leg with two lanes of
approach◦ RT/bypass lanes on 61
◦ Thru/left and RT lanes on county approaches
Average Daily Traffic:◦ Hwy 61: 9,700
◦ CSAH 4: 4,100
◦ CR 4A: 1,400
Hardwood Creek Trail
Existing Conditions
Safety, 2008-2010:◦ 10 crashes (14 people injured)
◦ No issue with recognizing stop
condition
◦ #473 in crash cost*
◦ Compared to other similar
intersections: 2x higher % right angle
3x higher % rear end
2.5x higher crash rate
Existing Conditions, cont.
* 8,200+ intersections in ranking
City, county, state priority
HSIP Regional solicitation for 2013-2014
Submitted as traffic signal with turn lanes
Received funding for 201420122013
Project History
Signal vs. RoundaboutIssue Traffic Signal Roundabout
Safety- Expected Crash Reduction*
Moderate benefit- 50% reduction
High benefit- 70% reduction
Crash Severity Moderate (still 25% right angle)
Low (virtually no right angle)
Operations High efficiency High efficiency
Benefit/Cost 1.0 2.0
Aesthetics Less pleasing More pleasing
O&M Costs Power, heads, LEDs, cabinet Landscaping, signs
Construction Under traffic Some closures & detours*based on FHWA crash modification clearinghouse
All-way stop eliminated based on 2030 operations ICE recommends roundabout
Roundabout Safety
Source - Insurance Institute for Highway Safety
Preliminary Layout
Construction Staging Options Full closure
◦ ~$1.2 million – no city cost
◦ 2-3 months, summer◦ Incentives, A+B, lane
rentals to minimize length◦ Benefits: quicker
completion, less expense, safer, better product
Construction Staging Options Temp bypass
◦ Hwy 61/4A as temp all-way stop, three legged intersection
◦ +$200k (no city cost)◦ 3.5-5 months◦ Impacts school year◦ 3 weeks full closure◦ Benefit: keep intersection
partially open
No hazards in the middle or
clear zone (trees, boulders)
◦ Grasses, shrubs, flowers,
perennials are ok
Standard landscaping:
minimal maintenance seed
(similar to signal option)
City responsibility for
Costs/maintenance above
standard
Landscaping Options
TH 7/TH 25 St. Bonifacius
Schedule an open house Final design starting now Construction in 2013
Next Steps
Questions or Comments?