I would like to be warned about upcoming traffic jams and given the option to reroute, even if it takes a bit longer.
If there is a traffic slow down of greater than 0.5 miles to less than 30% of the posted speed limit, a notification should be sent far enough in advance to allow the user to choose another route, even if it takes longer. I have traffic jams enabled but do not receive advance notification until it’s too late and I am stuck.
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Mark commented
The jam always seems to begin just after an exit and there is often a fairly convenient detour.