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Bicycles May Use Full Lane
The Bicycles May Use Full Lane sign, also referred to as BMUFL or R4-11, is a traffic sign used in the United States to:
The sign consists of a graphic image of a bicycle, followed by the words, "May Use Full Lane".
BMUFL was first specified in Chapter 9B of the 2009 Manual on Uniform Traffic Control Devices, and was replaced with the Bicycles Allowed Use of Full Lane sign (R9-20) in the 11th Edition in 2023.
A study conducted by the City of Austin in 2010 showed that placement of BMUFL signs influenced cyclists to generally ride farther from the curb (an average of 0.31 ft [94 mm]), and drivers moved further left as they passed bikes after the signs were installed, such that the percentage of motorists who passed within 3 feet (0.91 m) of the bicyclist dropped from 44% to 0%.
The 2012 edition of the California Manual on Uniform Traffic Control Devices indicates that the Bicycles May Use Full Lane Sign be used "where travel lanes are too narrow for bicyclists and motor vehicles to operate side by side" to "inform users that bicyclists might occupy the travel lane":
Section 9B.06 Bicycles May Use Full Lane Sign (R4-11)
"Bicycle May Use Full Lane" signs are not approved for use in Michigan according to the September 2013 Edition of the Michigan Manual on Uniform Traffic Control Devices since they are "not applicable" under state law.
In 2012, the City of Encinitas, California installed shared lane markings and Bicycles May Use Full Lane signs along Coast Highway 101 to "alert motorists that cyclists have the legal right to take the lane".
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Bicycles May Use Full Lane
The Bicycles May Use Full Lane sign, also referred to as BMUFL or R4-11, is a traffic sign used in the United States to:
The sign consists of a graphic image of a bicycle, followed by the words, "May Use Full Lane".
BMUFL was first specified in Chapter 9B of the 2009 Manual on Uniform Traffic Control Devices, and was replaced with the Bicycles Allowed Use of Full Lane sign (R9-20) in the 11th Edition in 2023.
A study conducted by the City of Austin in 2010 showed that placement of BMUFL signs influenced cyclists to generally ride farther from the curb (an average of 0.31 ft [94 mm]), and drivers moved further left as they passed bikes after the signs were installed, such that the percentage of motorists who passed within 3 feet (0.91 m) of the bicyclist dropped from 44% to 0%.
The 2012 edition of the California Manual on Uniform Traffic Control Devices indicates that the Bicycles May Use Full Lane Sign be used "where travel lanes are too narrow for bicyclists and motor vehicles to operate side by side" to "inform users that bicyclists might occupy the travel lane":
Section 9B.06 Bicycles May Use Full Lane Sign (R4-11)
"Bicycle May Use Full Lane" signs are not approved for use in Michigan according to the September 2013 Edition of the Michigan Manual on Uniform Traffic Control Devices since they are "not applicable" under state law.
In 2012, the City of Encinitas, California installed shared lane markings and Bicycles May Use Full Lane signs along Coast Highway 101 to "alert motorists that cyclists have the legal right to take the lane".