12/15/2010 PLANNING BOARD Minutes

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i Chairman Waygan refercnced VAI's letter and their analysis of 5 specific rotary recommendations. Mr. Cannon highlighted the five options. The"modern roundabout rem-fit" opfi n would nv rt the existing rotary without affecting the interior diameter circle, introducing deflection at the entryway and inc;reased signage and pavement marldngs. Changes would be made to the approaches which is less intrusive and less costly.and,may be a short term solution while considering.a long term solution. Mr. I ooharian questioned the amount of increased traffic that could be served by the retrofit and Mr. Cannon responded that the amount could be developed and would depend upon the cxpense and the amount of pavement on the roundabout and the size of the approach, such as a two lane approach. It was noted that two lane approach generally results in a two lane rotary and Mr. Cannon added that the right lane of a two lane approach is generally intended as a right turn only lane. The"'modem roundabout reconstruction replac rnenf' references the reduction of the interior of the circle and the exterior of the circle which increases the capacity and'improves the safety of the rotary by Ming deflection that slows the}traffic. The "signalized intersection" replaces the rotary with atic signal but it would be a difficult transition because of the need to accommodate a large amount of traffic. A"signal rid rotary/multiple signals" requires space., such as maintaimng Rat. 128 through l is hpee and have Rt. 151 connect perpendicular with Great Nock Road Forth connecting to Rt. 15 1, with multiple traffic signals and Great Neck Road South connected to Rt. 128. Mr. Cannon noted that the scenario could result in 2-3 traffic signals side by side, Mr. Cannon added the possibility that traffic could be metered on its approach to the rotary with vaffic signals. "Grade-separations' is similar to the airport rotary in Hyannis with finger ramps and a roundabout on top. Mr. Cannon suggested that the"no build" option also be considered. fir. I ooharian queaioned the addition traf `ic 0 that would result from the recommended alternatives and lair. Cannon suggested that capacity could be doubled from present traffic conditions, adding that the signalised alternative may result in maintaining the present capacity. The Board was in agreement that the 5 alternatives be considered and that the increa.w or decrease of'the alternatives `capacity be communicated. Mr. Storrs-responded that the level of service will be considered and the study will be reviewed and all option will be coasidered. Chairman Waygan referenced the public meeting component in order to discuss the results of a rotary study and solicit public input, requ s ng that comments be addressed in the final report, Mr. Storrs responded that valid comments would be addressed. The Chair questioned whether public comment would also be part of the traffic study and Mr. Cannon responded that com ents would be reviewed for validity and requests will be made to correct any errors in the fug report. 1&. Storrs noted that, as a tri-party agreenment, the Board has access to technical experts at the Cape Cod Conmu*ssion in order to review the traffic study and that the Town pays the Cape Cod Commission $174,000 per year and should utilize their evertise for the 12 arms of review required by the Commission. I1rIr. Petersen requested confirmation from Mr. Cannon that other proposed developments will be considered in njn .tion with the Mashp Mr.Commons proposal. r. Storrs responded that the other developments would be considered as part of the tiraffiic study. Mr. Petersen noted that upon review of figures and the Jobs Fishing proposed development; the numbers did not seem to be considered. 11r. Storrs responded that the traffic study begins with ft- fc ccunts to establish bac ground volumes before loading the development proposed tier and, finally loading any other approved proposed development, built or not. Mr. Cannon noted that page 4 of the November r 19 proposed scope of work outlines the background traffic growth rate and thaxspecific development by others will be determined in consultation with the Planning Board, Nla&sDOT and the Cape Cod Commission. Mr. Cannon confirmed that.he will request that all significant traffic generators in A4ashpee be considered, such as the west end off Barnstable or the east end of Falmouth. Mr. Fudala added that the figures would be predicted out to 2030.