I think I understand what Nens was going to say.
The problem is that GPS can not know which is the end point (there may be dozen of them along the highway). And when you get to them it's already late.
Maybe the problem can be simplified.
Actually, there is no need for another camera, or cameras at all.
Simply, the user has to choose the starting point (first toll), and a ux start from then counting, and shows the distance traveled and average speed for that time constantly. On one every minute or two. Or kilometer. Including stop time during road.
When the driver sees that he is left a few kilometers to the goal toll ramp, (or 10km to the city, or...) he will know what to do. And he must stop ux of further counting manually.
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