Half Closures

Half closures are barriers that block travel in one direction for a short distance on otherwise two-way streets. They are good for locations with extreme traffic volume problems and non-restrictive measures have been unsuccessful.


  • Half Closures are able to maintain two-way bicycle access
  • They are effective in reducing traffic volumes


  • They causes circuitous routes for local residents and emergency services
  • They may limit access to businesses
  • Depending on the design, drivers may be able to circumvent the barrier


  • Average of 42% decrease in traffic volume, or a decrease of 1,611 vehicles per day (from a sample of 53 sites)

Similar Measures:

  • By closing the street in both directions, you have a Full Closure
  • By placing a barrier lengthwise along the center of a street past a side street, you have a Median Barrier
  • By placing the barrier diagonally through an intersection, you have a Diagonal Diverter

Cost Estimate(s):

  • $40,000 (Portland, OR), $35,000 (Seattle, WA)
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