So you expect me to buy an expensive traffic-GPS and then if I don't do what it advises, I'll be penalizid?? That's a good reason to Not buy one.

I would think traffic was it's own penalty. Why would I invest money to give up driving freedom at the risk of punishment? Seems to me I'm better off to just get stuck.

When I did work in the city, there was really only one highway-route to downtown from my area, so 're-routing' was essentially driving around the city to pick another of the routes in. They usually took far longer than sitting through a small traffic jam.

I think you may have misread the posting - these would be distributed free to drivers, and paid for via tolls or congestion charges...

Technically, the local traffic conditions would be transmitted terrestrially or by satellite radio sub-channels, The GPS satellite system hasn't the facility for such data.

I am not sure of directly subsidising the units or service (if any), but perhaps have tax benefits for owning such a system.