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A666
A666
	A666 near Farnworth
Major junctions
South end	Pendlebury; 53°30′09″N 2°18′37″W / 53.5025°N 2.3103°W
	A6 / A580; A6044; M60; A667; M61 / A6053; A575; A579; A676; A673; A6099; A58 / A675; M65; A6062; A6078; A6119; A59;
North end	Langho; 53°48′31″N 2°26′41″W / 53.8086°N 2.4448°W
Location
Country	United Kingdom
Primary; destinations	Bolton; Blackburn;
Road network
	Roads in the United Kingdom; Motorways; A and B road zones;

The A666 is a major road in Greater Manchester and Lancashire, England.

Route

The road runs from its junction with the A6, and A580 at the Irlams o' th' Height boundary with Pendlebury near Manchester, through Pendlebury, Clifton, Kearsley, Farnworth, Bolton, Darwen and Blackburn before meeting the A59 at Langho. Along the route are the West Pennine Moors, the Turton and Entwistle reservoir and the Entwistle reservoir forest.

Road names

Most common names

The road is mostly known as Manchester Road, Bolton Road, or Blackburn Road, depending on which area it is in.

Devil's Highway

It is sometimes referred to as the Devil's Highway^[1] or the Devil's Road^{[citation needed]} because of Biblical associations of its number 666, and its high accident rate on the moors between Egerton and Darwen.

Crash rate

Because of a crash rate that was three times higher than motorways in the borough, with 26 vehicle collisions and crashes a year and 40 people injured, road works and other changes were introduced, including the speed limit changed from 70 mph to 50 mph, speed cameras, better safety fencing, banning cyclists from the road, and slip road changes. Finished at the start of 2000, these reduced road accidents by 60%.^[1]