Phil, yes, seriously MST – for example, the simulated Afghan compound and patrol base on STANTA at Thetford have a public road running right round the side of them, not more than 100m away; the Pennine Way runs right across the top of Otterburn training area; there are a number of public roads and ROW that run across the Epynnt where the Infantry Battle School trains the Infantry’s NCOs and junior officers in preparation for leading troops on ops. Given the IED threat, standard platoon/section movement is quite often by known road/path/trail as the “proven route”… I can speak from personal experience of all of these examples!
And yes having random ramblers, etc, stumble in to an dry ambush is actually quite funny when you see the looks on their faces when they set off the trip flares and initiate the dummy Claymore mines. Moral of the story – red flags and lights are there for a reason! 😀