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polygonum

On 28/12/2013 20:39, wrote:
dennis wrote:
The satnav may know which roads are closed, the map wont.

How does a satnav know that roads are closed? A satnav is
simply a map that knows dynamically where on the map it is,
it isn't psychic.

jgh

At least two of the satnavs I use are able to re-route on the basis of
dynamically supplied information. Information about the traffic (speed,
density, etc.) is fed into the routing and, if they identify an
alternative route that should save more than some threshold time, they
re-route. Amazingly effective they can be.

--
Rod