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.
- nominalise
- nominalism
- nominalist
- nominalistic
- nominalistically
- nominality
- nominalizable
- nominalization
- nominalize
- nominalizer
- nominal ledger
- nominally
- nominal relative
- nominal relative clause
- nominal species
- nominal taxon
- nominal value
- nominate
- nominated Parliament
- nominately
- nominate species
- nominatim
- nomination
- nomination borough
- nominative