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