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?