Applicable Countermeasures

Regulatory sign restricts curb lane use to buses, bicycles, and right-turning vehicles.

Photo by Michael King

Photo by Michael King
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Photo by Dan Burden
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Sign Improvements

Signs often convey important information that can improve road safety. The intent is to let bicyclists and motorists know what to expect, thus improving the chances that they will react and behave appropriately. For example, the use of a "No Parking in Bike Lane" sign is intended to keep this space clear for cyclists. Sign use and placement should be done carefully, in that overuse often results in non-compliance and/or disrespect. Excessive use of signs can also create visual clutter and lead to the intended sign and message getting "lost."

Regulatory signs, such as STOP, YIELD or turn restrictions require driver actions and are enforceable. NO TURN ON RED signs can improve safety for bicyclists (and pedestrians). Problems often occur at RTOR locations as motorists look to the left for a gap in traffic, especially if bicyclists are riding wrong way either in the street or on a sidewalk or path.

Warning signs can also provide useful information. An example is the SHARE THE ROAD sign, which serves to let motorists know that bicyclists may be on the road and that they have a legal right to use the road. This sign is typically placed along roads with significant bicycle traffic but relatively hazardous conditions for riding, such as narrow travel lanes with no shoulder, roads or streets with poor sight distance, or a bridge crossing with no accommodation for bicycles. Special signs are sometimes used to indicate the presence of a bicyclist.

All signs should be periodically checked to make sure that they are in good condition, free from graffiti, reflective at night, and continue to serve a purpose.


  • Provide warning and regulatory messages, as well as useful information.
  • NO TURN ON RED signs can increase bicycle safety and decrease crashes with right-turning vehicles.
  • SHARE THE ROAD signs can make motorists more aware of bicyclists on roads with poor bicycle accommodations.

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  • Streets with bicycle traffic should be evaluated to determine if sign improvements could improve safety.
  • Prohibiting RTOR is a simple, low-cost measure. The change can benefit bicyclists on streets with considerable through bicycle traffic with minimal impact on motor vehicle traffic.
  • Part-time RTOR prohibitions during the busiest times of the day may be sufficient to address the problem.
  • RTOR signs should be clearly visible to right-turning motorists stopped in the curb lane at the crosswalk.
  • Carefully evaluate use of both regulatory and warning signs. Avoid overuse which may lead to non-compliance or visual clutter

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Estimated Cost

Costs range from $30 to $150 per typical sign plus installation at $200 per sign. Electronic sign costs vary widely but tend to be significantly more expensive.

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Case Studies

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