From my limited understanding of current technologies, I can say that any single design using just one frequency is doomed.
Just in case Google for articles showing the las developments that overcome that kind of cheating. I am affraid that your learning experience, if applied in the roads, would cost you dearly in terms of $$$ and time behind the bars.
The way I understand it, you could cause interference but just sitting at a fixed point near the road. In motion they will beat you.
Do something else or choose to travel in a big country with long extensions of land with nobody there.
Locally, we have some places where the road was built in a straight line for more than 50 Km.
Speeding there has a different problem than what you could expect: no fines but falling asleep. It happens. Believe me.
Added bonuses: no mobile phone coverage and not so much people in dark hours. And there is winter too...