Collapsible vehicle camera arm assembly

A vehicle arm assembly includes a carrier base for attaching to a vehicle. A support arm is rotatably mounted relative to the carrier base. A first detent ring includes a plurality of first detent projections circumferentially offset by a plurality of first detent channels. A second detent ring includes a plurality of second detent projections circumferentially offset by a plurality of second detent channels. The first detent ring is fixed relative to one of the carrier base or the support arm. The second detent ring is fixed relative to the other of the carrier base or the support ring. The first detent ring is in an intermeshing arrangement when the second detent ring in a first rotational position and in a non-intermeshing arrangement when in a second rotational position. In the second rotational position a first stop surface fixed relative to the carrier base is in engagement with a stop fixed relative to the support arm.