An indicator device for use by the rider of a non-enclosed vehicle such as a cyclist or a motorcyclist that comprises a light emitting unit 18, a means 12 for attaching the light emitting unit 18 to a rider, a control unit (20, fig.5), incorporating a flashing circuit, which is in operative connection with the light emitting unit 18, a manually operable switch 24 that is in operative connection with the control unit 20 and an ambient light sensor 22 which varies the light output of the light emitting unit 18 in response to the sensed ambient light levels. The control unit 20 may switch between a day time mode and a night time mode and may be adapted to cause a greater light output from the light emitting unit 18 in response to a higher ambient light condition. The light emitting unit 18 may be attached to the wrist 13 of a rider such that when a riders arm is extended the light output may be directed forwardly or rearwardly.
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