how do speed cameras collect the cars number plates if they speed? – Secondary 11

Question: how do speed cameras collect the cars number plates if they speed?
- Keywords:
  car,
  number plate,
  speed camera,
  technology
Asked by cheese2000 to David, Jonathan, Ou, Pete, Sam on 24 May 2012.
- Pete Etchells answered on 24 May 2012:
  
  When you’re caught speeding, the speed cameras take two photos of your car – one normal one, and one infrared one. The number plate in the photo can then be matched against a national database to figure out who owns the car. The infra-red photo is used in case someone is trying to obscure their number plate in some way.

Question: how do speed cameras collect the cars number plates if they speed?