Howard asked: Can you place a card stating it is” illegal to park in bike lane” on windshield of car that is parked in the bike lane?
Then only related statutes concern throwing advertising materials into a motor vehicle or obstruct the safe operation of a motor vehicle.
s. 316.2055 – Motor Vehicles, Throwing Advertising Materials In
It is unlawful for any person on a public street, highway, or sidewalk in the state to throw into, or attempt to throw into, any motor vehicle, or offer, or attempt to offer, to any occupant of any motor vehicle, whether standing or moving, or to place or throw into any motor vehicle any advertising or soliciting materials or to cause or secure any person or persons to do any one of such unlawful acts.
s. 316.2045 – Obstruction of Public Streets, Highways, and Roads
(2) It is unlawful, without proper authorization or a lawful permit, for any person or persons willfully to obstruct the free, convenient, and normal use of any public street, highway, or road by any of the means specified in subsection (1) in order to solicit.
Advertising materials are frequently placed on parked vehicles without any apparent conflict. It is recommended that you quote the statute on the card.
s. 316.1945 – Stopping, Standing, or Parking Prohibited in Specified Places
(1) Except when necessary to avoid conflict with other traffic, or in compliance with law or the directions of a police officer or official traffic control device, no person shall:
(a) Stop, stand, or park a vehicle:
6. On an exclusive bicycle lane