That's how it actually works in some places (https://www.carwow.co.uk/blog/average-speed-cameras-how-do-t...). You don't need AI because we already know that distance = speed * time. We can calculate to a high degree of certainty - with high school math - that you had to have 1. been speeding or 2. bent space time if you cover the distance between them in too short of time.