“Speed bumps are never the answer when chicanes and choking a street to one lane briefly with curb extensions get the same job done more safely. There’s literally no application where speed bumps are more appropriate than a chicane or chokers in any location they’ve been used by PBOT [Portland Bureau of Transportation] so far.”
From Paul Johnson on BikePortland.org.
Photo of drivers straddling the streetcar tracks and impeding the bike lane, in Lovejoy Street in Portland, Oregon.