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Intersection Safety Improvements to Diamond Hill RoadCumberland Town Council ‐ Feb 17, 2016

Diamond Hill Road

Study Area

Intersection Safety Improvements To Diamond Hill Road

Intersection Safety Improvements To Diamond Hill Road

• Diamond Hill Road at Interstate 295 Ramps:• In Top 10 Unsignalized Intersections Experiencing Crashes with High Injury 

Potential (Angle/Broadside) (2009‐2013 period)• 65 total reported crashes• 14 injury crashes • 24 angle crashes

• Diamond Hill Road at Industrial Drive• 35 total reports crashes• 7 injury crashes• 18 angle crashes

• Diamond Hill Road at Bear Hill Road/Angell Road• 72 total reports crashes• 17 injury crashes• 55 rear‐end crashes

RI’s Highway Safety Improvement Program

Intersection Safety Improvements To Diamond Hill Road

• Misjudge gaps to turn to/from ramps

• Poor intersection sight distance

Crash Trends

Intersection Safety Improvements To Diamond Hill Road

• Current intersection configuration has numerous conflict points

Crash Trends

Intersection Safety Improvements To Diamond Hill Road

• Vehicle queue along northbound off‐ramp extend to Interstate 295 mainline

• Left‐turning vehicles with no gaps

Crash Trends

Intersection Safety Improvements To Diamond Hill Road

• Vehicles misjudging gaps due to high speeds and close proximity to 2‐1 lane merging area

• Poor intersection sight distance

Crash Trends

Intersection Safety Improvements To Diamond Hill Road

• Low‐severity rear‐end type crashes due to congestion/driver frustration

• Lack of pedestrian crossing signal equipment

Crash Trends

Intersection Safety Improvements To Diamond Hill Road

• December 2014 ‐ RIDOT and Cumberland Police conducted Road Safety Assessment

• Numerous recommendations from assessment

• December 2015 – RIDOT and Cumberland Officials meet and discuss the recommendations

• Town would like to advance roundabouts at the 2 off‐ramps 

• Requires slight capacity improvements to Chapel Four Corners intersection and between Northbound Ramps and Chapel Four Corners 

• Install signal equipment (conduit and handholes) at Industrial Drive for future installation of traffic signal (if needed)

Road Safety Assessment

Intersection Safety Improvements To Diamond Hill Road

• Roundabouts can reduce high severity angle type crashes between 50‐80%

• Diamond Hill Road/Interstate 295 Off‐Ramps –

• Benefit‐Cost Ratio ‐ 1.0

• Projected to reduce 12‐20 angle/broadside crashes 

Projected Safety Benefits

Intersection Safety Improvements To Diamond Hill Road

• Interstate 295 Ramps

• Roundabouts ‐ $2.9 Million

• Industrial Drive

• Widening ‐ $270,000

• Chapel Four Corners (Bear Hill Road/Angell Road to Interstate 295 Ramps)

• Widening/Intersection Realignment/Traffic Signal Modifications ‐ $1.6 Million

Estimated Construction Costs

Intersection Safety Improvements To Diamond Hill Road

• ROW Takings

• Approx. 3,000 s.f. of property acquisition along the corridor due to the roadway widening (Property acquisitions mainly located at intersection of Diamond Hill Road/Old Diamond Hill Road and Diamond Hill Road/Industrial Road)

• Temporary Easements and Permanent Aerial Easements will be required for construction

• Utility Pole Relocation

• 16 Utility Poles that will require relocation due to the roadway widening

• Environmental Permitting

• Coordination with Interstate 295 Overpass Bridge Project

• Minor impact to Church frontage (within RIDOT ROW)

Potential Impacts

Intersection Safety Improvements To Diamond Hill Road

• Finalize Conceptual Design – March 2016 (dependent on Town approval)

• Begin Final Design – May 2016

• Complete Final Design – Late 2017/Early 2018

• Begin Construction – Mid‐Late 2018

• Construction Complete – 12‐18 months (estimate only‐ subject to change once final design is complete)

Next Steps

Intersection Safety Improvements To Diamond Hill Road

Intersection Safety Improvements To Diamond Hill Road

Intersection Safety Improvements To Diamond Hill Road

Intersection Safety Improvements To Diamond Hill Road

Thank You

Questions?

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Intersection Safety Improvements To Diamond Hill Road