Diagonal Diverters

Diagonal diverters are barriers placed diagonally across an intersection, blocking through movements and creating two separate, L-shaped streets. Like half closures, diagonal diverters are often staggered to create circuitous routes through the neighborhood as a whole, discouraging non-local traffic while maintaining access for local residents. They are good for inner-neighborhood locations with non-local traffic volume problems.

Advantages:

  • Diagonal Diverters do not require a closure per se, only a redirection of existing streets
  • They are able to maintain full pedestrian and bicycle access
  • They reduce traffic volumes

Disadvantages:

  • They cause circuitous routes for local residents and emergency services
  • They may be expensive
  • They may require reconstruction of corner curbs

Effectiveness:

  • Average of 35% decrease in traffic volume, or a decrease of 501 vehicles per day (from a sample of 27 sites)

Similar Measures:

  • By placing a barrier across a street along only one stem of the intersection, you have a Full Closure
  • By placing a barrier only half-way across a street along only one stem of the intersection, you have a Half Closure
  • By placing the barrier length-wise along the roadway centerline across a side street, you have a Median Barrier

Cost Estimate(s):

  • $85,000 (Seattle, WA)
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