It's in a field next to the motorway fence and Crowood Leisure at junction 11, it's as you get to the top of the slip of the road going on to the M65 at J11.
If you want to get to it ( not sure if you can walk right up to it) it's a pain from Accy because it's the junction you can't get off at eastbound, the one near Asda. You either need to drive through Burnley centre and go to the roundabout for the motorway at J11, or go through to J12 and come back on yourself. It is quite striking and you won't miss it if you go on the M65
