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:

designate roads with lanes that are too narrow to be safely shared side-by-side by a bicycle and another vehicle to indicate that bicyclists may occupy the full lane to discourage unsafe within-lane passing
encourage bicyclists to use the full lane to discourage unsafe within-lane passing
encourage motorists to change lanes to pass bicyclists
warn motorists that bicyclists may be using the full lane

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.^[1]

^ "Part 9, Traffic Control for Bicycle Facilities" (PDF). MUTCD 11th Edition. National Highway Traffic Safety Administration. December 19, 2023. p. 1161. Retrieved December 19, 2023. 02 The Bicycles Allowed Use of Full Lane (R9-20) sign (see Figure 9B-1) may be used on roadways where no bicycle lanes or adjacent shoulders usable by bicycles are present and where travel lanes are too narrow for bicycles and motor vehicles to operate side-by-side. 03 The Bicycles Allowed Use of Full Lane sign may be used in locations where it is important to inform road users that bicyclists might occupy the travel lane.

[1] "Part 9, Traffic Control for Bicycle Facilities" (PDF). MUTCD 11th Edition. National Highway Traffic Safety Administration. December 19, 2023. p. 1161. Retrieved December 19, 2023. 02 The Bicycles Allowed Use of Full Lane (R9-20) sign (see Figure 9B-1) may be used on roadways where no bicycle lanes or adjacent shoulders usable by bicycles are present and where travel lanes are too narrow for bicycles and motor vehicles to operate side-by-side. 03 The Bicycles Allowed Use of Full Lane sign may be used in locations where it is important to inform road users that bicyclists might occupy the travel lane.

[1]