Sandra asked: I see drivers constantly drifting into designated bike lanes. If there are no bicyclists riding in the lane can a cop still pull them over and give them a ticket or is the bike lane considered part of the lane of travel as long as there are no bicyclists present?
The usual motor vehicle cannot be driven only within a 4-5 foot bike lane. Drivers can be cited for violating the following statute:
s. 316.089 – Driving on Roadways Laned for Traffic
Whenever any roadway has been divided into two or more clearly marked lanes for traffic ….
(1) A vehicle shall be driven as nearly as practicable entirely within a single lane ….
There may be reasons to momentarily and legally enter a bike lane if there is good cause, such as avoiding a hazard. A bicyclist in the bike lane would still have precedence, and the motorist should not endanger the cyclist.
See this post about mopeds and motorcycles in a bike lane: