Ontario started doing this a year ago (again - they used to do it in the 70s).
http://www.cbc.ca/canada/toronto/sto...opp-plane.html
I saw a report on the news and they don't need to fly very low, they just go by 2 marks on the road. They know how far apart the marks are so it is easy to figure out your speed.
Quote:
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Aircraft observers use the Robic stopwatch Model SC-808 to monitor and determine vehicle speeds. As the target vehicle crosses the painted “hash mark” on the highway, the watch is activated. When the vehicle crosses the next roadway marking 500 metres away, the stopwatch is deactivated and the vehicle speed is automatically calculated and displayed. The use of this technology ensures accuracy and efficiency in speed enforcement from the air.
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http://www.opp.ca/Organization/Traff...pp_006442.html
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