(a) Official devices located at airports, designated parking areas, transportation mode interchange points, depots, and similar public service facilities shall be exempt from the provisions of this subchapter.
(b) The provisions of this subchapter shall neither apply to any oscillating, rotating, or flashing railroad signal or safety light at any railroad crossing or upon any railroad right-of-way nor to the oscillating headlights on any railroad locomotive.
(c) The prohibition set out in § 27-73-204 does not apply to signs or devices with constant illumination and color, including those in which the only movement is a very slow, steady rotation of the entire body of the sign or advertising device.