On 02/02/2016 23:07, T i m wrote:

I'd agree for unpredictable congestion but argue that local knowledge
would probably win over any GPS congestion displays. I've been taken
on routes by the GPS I wouldn't typically take because I know all the
little side options etc.

My tomtom knows the traffic congestion around here better than I do.
The system actually knows how long its taking to get down a road while
the local knowledge only knows its usually a five minute delay.
The tomtom will take you down the quickest route it can find and
includes the back streets.