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Rechannelizations Make Roads Safer

There has been a lot of interest in rechannelizations over the past few months, especially with SDOT’s proposal for NE 125th and the recent work on Nickerson.  SDOT makes such changes to a street’s configuration to reduce vehicular speeds and make the road safer, especially for vulnerable users like pedestrians. 

Seattle has been successfully installing these “road diets” since the Uhlman Administration and we are not alone in doing so.  Cities such as San Francisco, Portland, Orlando, Oakland and New York all utilize them to make their streets safer.  Though a rechannelization also allows us to incorporate wider lanes to better serve freight or install bike facilities, these are secondary to our primary goal of enhancing safety.      

We often hear that these rechannelizations will increase congestion, diminish roadway capacity or cause more crashes.  However, those concerns never actually materialize on roads that have been improved in this way.  What one can document here and elsewhere are lower speeds, less crashes and fewer injuries from collisions.  These are changes that benefit everyone from pedestrians to motor vehicle operators.

The recent examples of Stone Way N and Fauntleroy Way SW highlight how these inexpensive striping changes improve safety with no additional equipment or personnel costs.  In fact, we recently studied how Stone Way performed after the change in lane layout and documented that:     

  • Motor vehicles now travel at speeds nearer the legal limit; 
  • Total collisions dropped 14 percent with injury collisions down 33 percent;
  • Pedestrian collisions declined significantly; 
  • Bike trips increased 35 percent but collisions per bicycle trip have declined; and
  • Volumes show the roadway still easily accommodates motor vehicle traffic.

(You can read the full Stone Way report here:

Having rechannelized 26 different roads in Seattle over the past several decades, SDOT can confidently state that “road diets” make our roads safer for all.  And do so in a way that keeps traffic moving.