<P> In California, headlight flashing is legal in some situations and illegal in others . It is legal for a driver to flash his headlights to indicate intention to pass on a road which does not allow passing on the right . However, headlight flashing on multiple - lane highways is illegal . </P> <P> In Florida, headlight flashing is protected free speech pursuant to the First Amendment . Additionally, on 1 January 2013, § 316.2397 (7), Fla . Stat . was amended to legalize headlight flashing . In 2005 and 2011, judges in County Court held that flashing a vehicle's headlights is not a violation of § 316.239 (7), Fla . Stat . </P> <P> In Illinois, a "flashing to warn" citation was successfully defended on May 7, 2015 in Boone County, via People vs. White, as the bench trial judge found the use of Illinois Vehicle Code 12 - 212 (b) addresses lighting equipment, but not motorist behavior relative to usage of lighting systems . </P> <P> In Louisiana, drivers who flash headlights are typically cited for a violation of Louisiana Revised Statute Title 32: 327, Section C which states: Flashing lights are prohibited except on authorized emergency vehicles, school buses, or on any vehicle as a means of indicating a right or left turn, or the presence of a vehicular traffic hazard requiring unusual care in approaching, overtaking or passing . </P>

When are drivers allowed to flash their headlights at you