The following links provide information on political campaign sign usage:
Florida Statute 106.1435 - Usage and removal of political campaign advertisements
Florida Department of Transportation - Notice to candidates
Florida Department of Transportation - Right of Way Guidelines
Putnam County Ordinances Sec. 45-739 - Political campaign signs
City of Palatka Ordinances Sec. 62-9 - Political Signs
Town of Pomona Park Ordinances Sec. 78-4 - Signs - Standards
Town of Interlachen Sign Ordinance