onto the Hawthorne Bridge sidewalk.
(Photos by J. Maus/BikePortland)
Multnomah County has installed a series of speed bumps (a.k.a. rumble strips) on SE Madison Ave as it approaches the Hawthorne Bridge (westbound). The bumps are aimed at reducing bicycling speeds as riders transition from the on-street bike lane up a ramp to the shared sidewalk which also happens to be the location of a TriMet bus stop. This bike lane is slightly downhill and bike speeds are relatively high.
There are five bumps placed about two feet apart and they’re made up of thermoplastic strips about an eighth-of-an-inch think. That might not seem very high, but on a bicycle the bumps can definitely be felt — especially for riders with narrow tires. We’ve heard a lot of feedback so far that not only are the bumps jarring but many people swerve into the adjacent vehicle lane to avoid them.