Traffic light visor

Every now and then traffic lights stop working. When this happens it is customary to deploy signs to warn road users, and covers for the traffic lights. However, if these signs could be built into the traffic light it could save time and inconvenience.

The diagram below illustrates a set of drop-down visors which could be deployed for non-functioning traffic lights. On the face of the visor could be an out-of-order message or a warning for drivers to drive carefully.

The visors could be remotely electronically deployed, allowing rapid response to traffic light failure. Ideally the visor mechanism would be on a separate circuit to avoid both the traffic lights and the visors being out of action simultaneously. Alternatively the visors could be mechanically deployed.