We live by the Thames Path. Our bit of it is closed at the moment for some building works. It's pretty well sign posted (as well as you'd expect) and the diversions are clearly marked. The diversion would be obvious to locals but the Thames Path gets much traffic from walkers and cyclists.
I've noticed something about peoples decision process when faced with this sign.
Everyone walks up to the sign, and the barriers, and peers round to see if it's true. Is the path really closed? Could I make it through? Whether they are a single walker, some elderly ramblers, a group of cyclists, American tourists or mums and buggies, everyone goes up to the sign to see if it's true.
Once they've established it is correct, they look around for an alternative route. If there is more than one person, some discussion ensues. Even though there is only one possible route round. It's sign posted and it's obvious, ie it's either follow the signs or go back the way you came.
So far everyone has done the same thing. But here's where something changes. The more people there are in the group the longer that decision takes. Every time. Direct correlation between people in group and time taken to discover the new route (even though it's sign posted).