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Centreline Bollards/Flex Bollards

Centreline bollards, also known as vertical centreline treatment, places vertical installations on the roadway to create a centre median. This treatment gives an illusion that the roadway is narrowed and constricted, encouraging drivers to reduce their speed.

Application/Considerations/Outcomes

  • Apply to two-lane local and collector streets
  • Avoid areas that may block driveways or cross street access and transit services
  • May be applied in conjunction with speed cushions
  • May require more detailed maintenance considerations
  • Fairly low-cost and easy to implement
  • Can help to reduce collisions between traffic lanes due to increased separation
  • Can result in decreases in 85th percentile speeds up to 5 km/hr (TAC Canadian Guide to Traffic Calming, 2017)

Image sources: Town of Newmarket, City of Greater Sudbury

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