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Helena staff show modeling for proposed roundabout at 11th/Last Chance; alternatives and costs discussed
Summary
Transportation staff and consultants presented 65% roundabout designs and traffic-model comparisons for the intersection near 11th Avenue and Last Chance Gulch; commissioners asked for a narrower stop-controlled alternative and a detailed cost breakout, including utility upgrades.
City transportation staff on Aug. 27 presented 65%-complete designs and modeling that compare a roundabout, a signal, and several stop-controlled alternatives for the intersection that serves 11th Avenue and Last Chance Gulch.
Staff and their consultant showed side-by-side simulations for a signalized intersection, an all-way stop, an all-way stop with pedestrian enhancements and a roundabout using peak traffic and pedestrian counts. The materials incorporated Miovision camera data the city collected; staff said pedestrian…
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