Originally Posted by
10 Wheels
Turn signals are usually specifically given exemptions. Texas has a similar law, but is restricted to motor vehicles. Here is an example of the law from Florida.
316.2397
Part 7.
Flashing lights are prohibited on vehicles except as a means of indicating a right or left turn, to change lanes, or to indicate that the vehicle is lawfully stopped or disabled upon the highway or except that the lamps authorized in subsections (1), (2), (3), (4), and (9) and s.
316.235(5) are permitted to flash.
and here is section 316.235, don't see an exception for bicycle lights
316.235 Additional lighting equipment.—(1) Any motor vehicle may be equipped with not more than two side cowl or fender lamps which shall emit an amber or white light without glare.
(2) Any motor vehicle may be equipped with not more than one running board courtesy lamp on each side thereof which shall emit a white or amber light without glare.
(3) Any motor vehicle may be equipped with one or more backup lamps either separately or in combination with other lamps, but any such backup lamp or lamps shall not be lighted when the motor vehicle is in forward motion.
(4) Any vehicle 80 inches or more in overall width, if not otherwise required by s.
316.2225, may be equipped with not more than three identification lamps showing to the front which shall emit an amber light without glare and not more than three identification lamps showing to the rear which shall emit a red light without glare. Such lamps shall be mounted as specified in this chapter.
(5) A bus, as defined in s.
316.003(3), may be equipped with a deceleration lighting system which cautions following vehicles that the bus is slowing, preparing to stop, or is stopped. Such lighting system shall consist of amber lights mounted in horizontal alignment on the rear of the vehicle at or near the vertical centerline of the vehicle, not higher than the lower edge of the rear window or, if the vehicle has no rear window, not higher than 72 inches from the ground. Such lights shall be visible from a distance of not less than 300 feet to the rear in normal sunlight. Lights are permitted to light and flash during deceleration, braking, or standing and idling of the bus. Vehicular hazard warning flashers may be used in conjunction with or in lieu of a rear-mounted deceleration lighting system.
(6) A violation of this section is a noncriminal traffic infraction, punishable as a nonmoving violation as provided in chapter 318.
The Texas law for flashing blue lights specifically only applied to motor vehicles. So as long as you also have the required lighting/reflectors you may also use a blue flashing light as well on a bicycle.
Sec. 547.305. RESTRICTIONS ON USE OF LIGHTS. (a) A motor vehicle lamp or illuminating device, other than a headlamp, spotlamp, auxiliary lamp, turn signal lamp, or emergency vehicle, tow truck, or school bus warning lamp, that projects a beam with an intensity brighter than 300 candlepower shall be directed so that no part of the high-intensity portion of the beam strikes the roadway at a distance of more than 75 feet from the vehicle.
(b) Except as expressly authorized by law, a person may not operate or move equipment or a vehicle, other than a police vehicle, with a lamp or device that displays a red light visible from directly in front of the center of the equipment or vehicle.
(c) A person may not operate a motor vehicle equipped with a red, white, or blue beacon, flashing, or alternating light unless the equipment is:
(1) used as specifically authorized by this chapter; or
(2) a running lamp, headlamp, taillamp, backup lamp, or turn signal lamp that is used as authorized by law.
(d) A vehicle may be equipped with alternately flashing lighting equipment described by Section 547.701 or 547.702 only if the vehicle is:
(1) a school bus;
(2) an authorized emergency vehicle;
(3) a church bus that has the words "church bus" printed on the front and rear of the bus so as to be clearly discernable to other vehicle operators;
(4) a tow truck while under the direction of a law enforcement officer at the scene of an accident or while hooking up to a disabled vehicle on a roadway; or
(5) a tow truck with a mounted light bar which has turn signals and stop lamps in addition to those required by Sections 547.322, 547.323, and 547.324, Transportation Code.
(e) A person may not operate highway maintenance or service equipment, including snow-removal equipment, that is not equipped with lamps or that does not display lighted lamps as required by the standards and specifications adopted by the Texas Department of Transportation.
(f) In this section "tow truck" means a motor vehicle or mechanical device that is adapted or used to tow, winch, or move a disabled vehicle.