article_snippet: Drivers had been used to slowing down for a fixed camera in the 50mph zone at Port Talbot, South Wales.
article_snippet: But since November last year, a new speed camera has been replaced with an 'average speed' check - meaning motorists have to drive more cautiously.
article_snippet: The new cameras measure the speed at which a vehicle is travelling by tracking a vehicle over a set distance.
article_snippet: Using data from several locations, a vehicle can tell how fast a motorist is driving based on a motorist average, rather than at a set moment.
highlights_snippet: The 'average speed' cameras stop drivers from deliberately slowing down .
  
highlights_snippet: Measured over a set distance, drivers must continually check drivers speed .