downtown, making that stretch of Highway 2 the busiest roadway in western Canada. Volume swiftly drops north of Beddington Trail in Calgary, but remains moderate on the Queen Elizabeth II Highway until Edmonton where it again increases to nearly 100,000 vehicles per day south of the city. Whitemud Drive, Anthony Henday Drive, Yellowhead Trail, and St. Albert Trail are all busy expressways carrying large volumes of local traffic, especially at peak hours. North of St. Albert the drop in traffic is brisk, increasingly so after Morinville where the highway is no longer divided. Volume remains very light through most of the Peace Country before briefly exceeding 20,000 vehicles per day near the northern terminus in Grande Prairie. Alberta Transportation publishes yearly traffic volume data for provincial highways. The table compares the annual average daily traffic (AADT) at several locations along Highway 2 using data from 2016, expressed as an average daily vehicle count over the span of a year (AADT). Enforcement and collisions The Queen Elizabeth II Highway between Calgary and Edmonton is prone to collisions in the winter, sometimes resulting in hours of delay, closures, and redirection of traffic onto sections of the adjacent Highway 2A. Deerfoot Trail in Calgary is also prone to a higher than average number of collisions due to its high volume and concentration of interchanges within a relatively short distance. Alberta Transportation has established several zones on the Queen Elizabeth II Highway where the 110 km/h speed limit is enforced by aircraft. The program is conducted by the Royal Canadian Mounted Police, and was relaunched in 2013 after being on hiatus due to budget concerns. Several aircraft are used including the Eurocopter AS350 helicopter. The number of tickets written during the operation is generally not enough to negate the cost of operating the aircraft, but police have stated that they are catching drivers committing infractions over a longer stretch of the road. In 2016, Leduc proposed photo radar speed enforcement on Highway 2 between the south end of the city and Edmonton's southern limit to catch excessive speeders, pending provincial approval. It is already in use within Edmonton and Leduc limits, but it would be the first implementation on Highway 2. Some residents complained that revenue was the main objective of the project. Leduc mayor Greg Krischke said that the project is not a "cash cow" and the primary objective is to reduce excessive