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Without a flash, the only evidence of speed camera on the outside of the car is a black rectangular box, which sends out the radar beam, about 30 cm by 10 cm, mounted on the front of the car. On the older models of the camera, and on rainy days or in bad light, a cable is used to link it to a box with a flash placed just in front of the vehicle.
The speed of a vehicle occluded by (hidden behind) another vehicle cannot be measured. This occlusion issue does not apply to fixed speed enforcement devices that can be mounted on poles or gantries up to 5-6 meters / 15 -20 ft high using radar as detection method. Fixed and handheld lidar systems reliable up to heights of roughly 2 meters / 7 ft.
Speed limits in Australia range from 5 km/h (3.1 mph) shared zones to 130 km/h (81 mph). Speed limit signage is in km/h since metrication on 1 July 1974. All speed limits, with the sole exception of the South Australian school and roadworks zones, which are signposted at 25 km/h, are multiples of 10 km/h – the last digit in all speed signs is zero.
The Locomotive Acts in the UK set speed limits for vehicles, and later codified enforcement methods. The first Locomotive Act, passed in 1861, set a speed limit of 10 miles per hour (16 km/h) in uninhabited areas, and 5 miles per hour (8.0 km/h) within towns. This act also included the value of fines for violations of the law.
The town of Swindon abandoned the use of fixed cameras in 2009, questioning their cost effectiveness with the cameras being replaced by vehicle activated warning signs and enforcement by police using mobile speed cameras: [53] in the nine months following the switch-off there was a small reduction in accident rates which had changed slightly in ...
The first permanent average speed cameras were installed on the A13 in 2002, shortly after the speed limit was reduced to 80 km/h (50 mph) to limit noise and air pollution in the area. [73] In 2007, average speed cameras resulted in 1.7 million fines for overspeeding out of a total of 9.7 millions.
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On freeways outside of Greater Melbourne, [10] the speed limit varies between 80 km/h and 110 km/h. Princes Freeway (East) (continues at Pakenham towards Melbourne as Urban Freeway) – Not entirely freeway standard, In Yarragon and Trafalgar there is residential property, business and local road access with 60 km/h speed limit.
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