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Longmont staff, consultant outline three alternatives — including a Dutch-style roundabout — for 21st and Main
Summary
City staff and consultant OV Consulting presented three families of concept designs for the 21st & Main intersection — focused spot fixes, compact/protected intersections and a Dutch-style protected roundabout — and heard extensive board questions on pedestrian safety, bicycle routing, transit integration and right-of-way constraints. A public meeting is set for Jan. 29.
City of Longmont staff and an outside consultant presented concept designs on Dec. 9 for the 21st Avenue and Main Street intersection, laying out short-term operational fixes and three geometric alternatives intended to reduce vehicle turning speeds and improve safety for pedestrians and cyclists.
Aaron Provo, senior civil engineer in Longmont's Public Works Department, said the project is in the concept design phase through March 2025 and that construction would depend on funding; staff hope to begin construction in 2027. Provo said the project stems from the Main Street Quarter plan and a public survey that drew nearly 700 responses identifying speeding, long signal waits and poor visibility of people walking and biking as the main concerns.
Chris Vogelsang, a consultant with OV Consulting, described three families of alternatives: focused spot improvements (lower cost, striping and raised tables), compact intersection options with tightened…
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