The TIRTL device is deployed as a speed measurement sensor in Victoria and New South Wales. The device consists of a pair of sensors embedded in the curb that use a series of infrared beams to monitor vehicles at wheel height. Although the sensors themselves are very difficult to see, they are accompanied by a standard Traffipax camera to capture images of the offence. The state of New South Wales approved the device in November 2008 for use in the state as dual red light / speed cameras (named "safety cameras" under the RTA's terminology).