Really there's only one thing the best dash cams need to do well: record sharp footage of what’s happening on the road and around the car ... Tim is TechRadar’s Camera’s Editor.

ES Best’s very own crash test dummy ... Mini-marvels of car-camera technology that mount with a clear view of the tarmac, most begin to film the minute you start your engine and then record ...

Some dashcam systems are expandable, allowing you to add up to four cameras to cover every side of a car ... camera. Professional drivers should always look for one with an interior view.