A666 road

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

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The A666 is a major road in Greater Manchester and Lancashire, England. Known as Manchester Road, Bolton Road, or Blackburn Road, depending on which area it is in, it 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.

It is sometimes referred to as the Devil's Highway or the Devil's Road because of Biblical associations of its number 666, and its high accident rate on the moors between Egerton and Darwen. Conversely, for a short length from the M61 Kearsley spur and bypassing Farnworth to central Bolton, it is officially called St. Peter's Way.