This is a very basic real-life problem that has got me baffled. In brief - why should a road that is always congested with commuter traffic be practically deserted whenever there are school vacations, when the traffic is not school-related? In more detail: Every day I drive to work I take a road through my village that gets really congested (typically it takes me at least 10 minutes to drive half a mile - thereafter I can take a much less used backroad to work). The cause of this congestion is traffic coming off the motorway (i.e. Brit equivalent of a US freeway) and using this road as a link to another, bigger, road that will take them to where they are going. Okay, so what? This sounds like a typical commuter's tale. Except that during school vacations the road is practically deserted. The most obvious answer to this is that I'm going to work during the school run period. But I'm not - the school run doesn't start until at least half an hour after I set off to work and in any case the other drivers are almost invariably single occupants (i.e. no kids are in the car). Nor is the cause teachers going to school (there's a whole lot of evidence why that I won't bore you with). Nor can it be that the road is deserted because loads of adults are taking time off to be with their kids during the vacation - Brits just don't take their holidays in this way, and in any case, this might account for some lowering of traffic volume, but not the truly dramatic drop in congestion. Anyone got any ideas, please?