Herman asked: Is there a minimum width requirement for a bike lane to be a bike lane?
Generally, a bike lane on a curb and gutter roadway is four feet wide, not including the gutter pan. On a flush shoulder roadway (No curb) it is five feet wide for new construction, but can be four feet for repaved roadways.
Florida Department of Transportation
Plans Preparation Manual
8.4.1 Bicycle Lanes
Where required by Table 8.1.1, a bicycle lane shall be provided for each direction of travel on the roadway. Bicycle lanes shall be marked in accordance with Design Standards and the MUTCD.
On curb and gutter roadways, a 4-foot minimum bicycle lane width measured from the lip of the gutter is required. This provides for a 5.5-foot width to the face of curb when FDOT Type F curb and gutter is used. The 1.5-foot gutter width should not be considered as part of the rideable surface area, but this width provides useable clearance to the curb face. A minimum width of 5 feet shall be provided when the bicycle lane is adjacent to on-street
parking, a right-turn lane, guardrail or other barrier.
On flush shoulder roadways, the paved shoulder described in Section 8.4.2 should be marked as a bicycle lane in or within 1 mile of an urban area.
Where parking is present, the bicycle lane shall be placed between the parking lane and the travel lane and have a minimum width of 5 feet. If the parking volume is substantial or the turnover is high, an additional 1 to 2 feet of width should be provided if available.
At intersections with right turn lanes, the bicycle lane shall continue adjacent to the through lane; between the through lane and the right turn lane, and shall be 5 feet in width for new construction and reconstruction projects. On RRR projects where the bicycle lane is required in accordance with Chapter 25, a 5-foot bicycle lane width should be provided (4- foot minimum).
Bicycle lanes shall be one-way facilities and carry bicycle traffic in the same direction as adjacent motor vehicle traffic. On one-way streets, bicycle lanes should generally be placed on the right side of the street. A bicycle lane on the left side of the street can be considered if it will substantially reduce the number of potential conflicts, such as those caused by frequent bus traffic, heavy right-turn movements, high-turnover parking lanes, or if there is a significant number of left-turning bicyclists.
8.4.2 Paved Shoulders
A paved shoulder is a portion of a roadway which has been delineated by edge line striping, but does not include special pavement markings or signing for the preferential use by bicyclists. Paved shoulders shall be 5 feet in width for new construction, reconstruction and RRR projects, however existing 4-foot paved shoulders on RRR projects may be retained.
A paved shoulder of at least 4 feet in width is considered to be a bicycle facility, however a minimum 5-foot clear width between the traveled way and the face of curb, guardrail or other roadside barrier is required.