I've been given route sheets on each of the Phils I've done, and there have usually been enough people riding to just follow the big group (though I have taken a slight wrong turn after descending Holme Moss before), plus they've put marshals on any particularly dangerous junctions. In general, it's been a well organised ride.
One annoying thing was that last year, they started from a different place in Stannington, but the route through Stannington to the end was quite poorly signed, and I know I wasn't the only one who ended up wasting 15 or 20 minutes going down to the bottom of a big hill, realising my mistake and riding back up again.