From the standards referenced above and to answer the claim that nothing can be added to the gate arms to increase visibility:
Option:
13 Red lights may be attached to traffic gates.
Standard:
14 If red lights are attached to a traffic gate, the red lights shall be steadily illuminated or flashed only during the period when the gate is in the horizontal or closed position and when the gate is in the process of being opened or closed.
So a flashing or steady red light can be added to the gate arm and fully comply with the standards
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Men plug the dikes of their most needed beliefs with whatever mud they can find. - Clifford Geertz
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