Traffic Cops (2003)

Season 18: Episode 5

PC Andy stops and breathalyses a van driver in Harrogate, but, at more than twice the legal limit, the young man tries to make a run for it. A public-spirited motorist follows a woman he suspects of drink-driving after spotting her buying alcohol at a York petrol station, recording her car weaving in the middle of the road on a dashcam, and passing the data on to the police.