speed trap 
noun
A radar trap.Putting up speed traps serves very little purpose for, when the flow of traffic suddenly slows down, we all know that we are approaching a speed trap....
- The hotel and pub owner has been cleared of failing to give information about who was driving one of his vehicles when it went through a speed trap.
- A road safety campaigner has backed controversial plans for a speed trap near where his daughter died in a crash.
- radiationless
- radiationlessly
- radiation pattern
- radiation pressure
- radiation pyrometer
- radiation pyrometry
- radiation resistance
- radiation sickness
- radiation therapy
- radiation thermometer
- radiation treatment
- radiative
- radiative capture
- radiative equilibrium
- radiative forcing
- radiatively
- radiator
- radiatore
- radiator grille
- radiator muff
- radiatory
- radical
- radical axis
- radical center
- radical centre