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Summary Results for: Roundabout Peer Review & Gap Project Evaluation. Roundabouts. Signals. Corridors. Presented by:. Presenter: Scott Ritchie, P.E. City Council: July 2, 2013. Agenda. 1) What is A Modern Roundabout? 2) Why Are Roundabouts Safer?
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Summary Resultsfor: Roundabout Peer Review &Gap Project Evaluation Roundabouts Signals Corridors Presented by: Presenter: Scott Ritchie, P.E. City Council: July 2, 2013
Agenda 1) What is A Modern Roundabout? 2) Why Are Roundabouts Safer? 3) Modern Roundabout Operations Visual 4) Rbt Peer Review Results / Recommendations 5) Open Discussion / Questions 6) Gap Project Evaluation Results / Recommendations 7) Open Discussion / Questions Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Study Area North N. Main Union Jackson River Maple Pine Bridge Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Evaluation Scope • Review Existing Conditions + Site Visit • Evaluate Union Signal Capacity • Evaluate Ped Xings • Provide Capacity & Safety Recommendations • Provide Technical Memo of Results • Present Results to Council Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Defined Scope Mid-Block Ped Xing Controlled Ped Xing N. Main Union Jackson River Maple Pine Bridge Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Jackson Crossing Relocated and incorporated into roundabout Modern Roundabout Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Defined Scope N. Main Union Jackson River Maple Pine Bridge Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Unique Signal Ops: • E Leg One-way w/ Continuous WB RT (except Ped phase) • S Leg One-way (two receiving) • W Leg RT Only/No Lefts (No RTOR) • 3 Approach Leg (Split Phasing) • Ped Only Phase (all red time) Resolution:Dual SB Thru Evaluation: LOS F Design Req’d Evaluation:Deficient SB Capacity Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Evaluation: EB No RTOR = Less Cap Resolution:RTOR Not Warranted Remove it… Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Evaluation: WB RT Constricted: Geometry, Parking, Driver Expectations, Ped phase, Xings, High RT Traffic, etc P P Resolution:Design Mods: Larger RT Rad, Channelize RT, Add Median, Landscape, Move Parking Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Evaluation: Ped only phase = Less Cap Resolution:Remove Ped Phase, Relocate Xings, Refuge Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Evaluation:Nearby Ped Xings Hinder Signal Ops = Less Cap Resolution:Merge Closely Spaced Xings (N & S of Signal) ? Resolution:Shorten Signal’s Cycle Length from 75s to 40s --(New Xing Location Subject To Signal Timing) Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Union Signal Capacity Resolution:LOS A Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Maple Crossings Resolution : • Check Warrants • Square Up Intx • Narrow MidB-Xing • +Bulb Out/Refuge • Reduce Parking • New Curbing Evaluation: - Xing Warranted? • Skew= Less Safety • Congestion • Distraction Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Pine Crossings Evaluation: - Xing Warranted? • SSD w/ Bridge? • Xing Previously Relocated due SSD? • Excessive Xings • Congestion • Car Expectations Resolution: - Check Warrants • Check SSD • Not Met=Remove • Met=Relocate w/ Overxing or Underx Scott Ritchie, pe, roundabout specialist www.roundabouts.us
River Crossings Evaluation: - 140’ Long Xing! • Skew = Less Safety • Lack of Sight Dist. Resolution: - Prohibit EB LT (ssd) • Geometric Mods Req’d (Pine & River) • One-Way River - 50’ Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Bridge Crossing Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Peer Review Recommendations • Don’t Allow the Gap Project To Simply Replace Extg • Authorize New Design Concepts to be Developed for Each Intx / Xing • Jackson Modern Roundabout • Maple Square Up Intx, New Curbs, Bulbs, Refuges • Pine Remove Xing?, Square Intx, + Curbs, New Xing • River New Curbs, RT-Out only, New Xing • Bridge Relocate • Union 2 SB Thru, WB RT Curbs, Lndscp, Xings, Time) Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Other Recommendations • Gap Project Area – Confident in Recom. • Union Signal Issues – Suspect Broader Network Issues • Conduct a Planning Level Downtown Transportation Revitalization Study • As a Visitor… other deficient issues in Downtown Area • Need Analysis and Resolutions (all rdwys interconnected) • RTE believes there are better solutions for downtown • Not Just for Traffic Capacity • Enhance Rochester Commerce, • All Mode Users (Peds, Cyclists, P, Trucks, Tourists, Commuters) • Improve Aesthetics, Landscaping, Street Furniture, Etc. • Create a “Sense of Place” • Future Land Use Planning • Accommodate Both Local Commuters and Local Businesses Scott Ritchie, pe, roundabout specialist www.roundabouts.us
Questions? Speaker: Scott Ritchie Roundabouts & Traffic Engineering (928) 284-0295 www.roundabouts.us Scott Ritchie, pe, roundabout specialist www.roundabouts.us
