Here is my personal experience. I tried to route from Philadelphia to New York with avoiding toll roads, the travel time is 13 hours!!!
With never avoid toll roads, the travel time is 2 hours...
I don't know how it get 13 hours but I guess it avoid all highways
That sounds about right.
Remember, these instructions, just like avoid freeways
are of the all or nothing
When you select that option TomTom will avoid ANY
place that charges toll.
This means the you will have to drive on mosty secondary roads and must avoid all bridge tolls.
Not being thoroughly familiar with the area I would guess that you probably will have to go up to Poughkeepsie, NY or higher to cross the river without charges.
Going down from White Plains to Manhattan shouldn't be that swift either.
At this point I decided to simulate the route. With tolls it came back at 1 hr 38 min. Without tolls it showed 2 hr 06 min.
That sounded ridiculous, so cheking the route I find that it was scheduled to go through thr Holland Tunnel !
Clearing route and doing it over again it came back this time that it could not plan a route.