I live in Shanghai and driving in the city traffic can take hours to go 1 mile. I live at the crossroads of 2 main motor ways so would like to plan my routes using these and not use small side roads. This does make my journey 4-5miles longer but I save time and petrol on the main roads doing a constant 50mph and no stop/go driving.

The only option I have is Shortest or Quickest route and the GPS directs you from a Main road onto side roads just to save 1/2mile in distance no matter what the option is set too.

Anybody know a car GPS make and model that you can set desired routes for main roads. At the moment I am using a TomTom 255 that is 4 years old and has run out of free map updates, so the cost of buying a new system is not so costly as it will have new maps.