[OSM-dev] Can you design roads to prevent routing?

[OJW]

On Saturday 28 July 2007 15:55, Nolan Darilek wrote:
> My understanding is that a* stops investigating paths that aren't  
> meaningful, so wouldn't move toward a point to the north by going  
> south

How long will it be before road designers invent an "a* trap" for villages 
(e.g. Z-bend of roads to prevent a* algorithms from routing through it)