There are more speed, red light and safety cameras on the road than ever before. In addition, police use approved speed measurement devices such as lidar and radar and in some instances the police can estimate your speed without using any measurement devices at all.
Speeding, red light and other camera offences usually result in an infringement notice being issued to the driver or the registered owner of the vehicle. Where higher speeds are involved the police may issue you with a court attendance notice and an immediate suspension notice meaning you cannot drive until the matter is determined by a court.
If you pay an infringement notice or are convicted by a court, demerit points apply to your licence which may result in your licence being suspended. The only ways to avoid incurring demerit points is to successfully ask for the infringement to be reviewed and withdrawn.
If you disagree with the infringement or court attendance notice or have been arrested or charged for a speeding or camera offence it is important to obtain legal advice on prospects of success, before embarking on defending an allegation.