Integral 6ft bike lane / curb and gutter
Integral bike lane-gutter pan curbs provide an extra-wide gutter pan that also serves as a bike lane and avoids the gutter pan-pavement seam that often decreases the available lane width available for cycling. Because these curbs are built of concrete, they typically provide additional contrast for the bike lane when built adjacent to asphalt pavements.
The bike lane pictured here is 6 ft wide, and includes use of contrasting materials (concrete for the bike lane and curb and gutter vs. asphalt roadway) providing additional visibility to the lane.
Photo is from Lowry Avenue, reconstruction completed in 2007 in Minneapolis. A similar design is used for on-street bike lanes on University Avenue near the the University of Minnesota.

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