2014-01-27 BOS Packet - Released

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AGENDA ITEM SUMMARY LEXINGTON BOARD OF SELECTMEN MEETING DATE:STAFF:ITEM NUMBER: January 27, 2014 William P. Hadley, Director I.1a SUBJECT: Traffic Safety Advisory Committee Recommendation – Reconstruction of Diamond School Traffic island into a Modern Roundabout EXECUTIVE SUMMARY: The traffic circle near the Diamond Middle school has been redesigned to make it conform to a Modern Roundabout Design. Currently this circle encourages pedestrians to access the center of the circle causing significant vehicular/pedestrian conflicts. The current design has some approaches operating as high speed bypasses and some approaches operation under stop control. There is poor sight distance at all approaches. The new design includes the following improvements: Realignment of all approaches to provide proper sight distance All approaches will be yield conditions Provides approach deflection to reduce all speeds to 20 MPH Relocate pedestrian traffic from the center of the circle to the perimeter reducing vehicular/pedestrian conflicts. Site inspection by Police and Engineering staff support this project. Traffic safety staff members comprised of the Police, Engineering, School Administration and Transportation Services reviewed and support establishing and maintaining this roundabout FINANCIAL IMPACT: The total cost of this project is estimated at $90,000; however this area is due for pavement maintenance which would be estimated at $50,000; the incremental cost to do this work in conjunction with the annual pavement management program is approximately $40,000 RECOMMENDATION / SUGGESTED MOTION: Reconstruction of Diamond School Traffic island into a Modern Roundabout as shown. The regulatory changes at this location would be converting three stop sign to yield signs, at the North Hancock, Hamilton and Diamond School approaches. STAFF FOLLOW-UP: If approved, the DPW Highway Dept will install and maintain this Roundabout. G:\\AGENDAS\\012714 TSAC-Diamond.doc