Some mobile speed cameras use Infra red to track you, they aim the beam at head lights ( the most reflective item on a car ).
So, run with small lights or day time covers, with out headlights showing you can reduce your tracking distance by up to 30%.
That can give you enough time to get on the brakes & get below the speed limit.
Also run old style ( non reflective ) plates if you can, & don't have your car painted red.
The wavelength of red, is right next to the infra red wave length, ( besides, it can also make some cars look very noddy car / gay looking ! )
As to radar,same as above- radar is just a few octaves below visible red- red paint is bad news, also any hard shiny surfaces particularly at right angles to the front..
Chrome grills bumpers etc, don't help.
Having a glass fibre car with out bling & a nice curvy front profile painted black or a dark colour is going to be hard to track,
To check your car, shine a red light at it at night.
What shines back the most, is what will hang you.
Perhaps a new class of rods- stealth rods!