In the future, sensors on your car will alert you that an object is behind you.

One device monitors the operation of the vehicle and uses sensors to alert the car and driver to road conditions.

The sensors alerted me, but I have not seen detailed scans.

The whir of the engine interrupted his telepathic concentration and his mental sensor alerted him.

Or, if the person fell, the sensors would alert others of the location by cellphone.

Driver-assistance systems use sensors to monitor the location of objects around the vehicle and alert the driver of impending dangers.

Once again, sensors alert a computer that the building has begun to move and a signal is sent to the thrusters.

The tanks landed and cruised across the terrain, their sensors alert.

If we went in at hyperdrive, we wouldn't even have the time to react to any danger that our sensors alerted us to.

Nearing the entrance, a sensor alerted a mechanism in the base of the glass door that it might soon have to open.