Bluff City in Tennessee, US, will implement a speed photo-enforcement programme that aims to provide safer highways.

The city has signed a contract with American Traffic Solutions to implement the programme on Highway 11-E.

A test study found that about 2,000 vehicles a day travel at 55mph through a 45mph speed zone.

The National Highway Traffic Safety Administration estimated that the cost of speed-related crashes is more than $40bn a year.

One third of road fatalities are due to high speeds. It is also a factor in property damage.