A young couple out walking along a pavement are hit by an out-of-control car, a young mum calls 999 when her baby is unresponsive, and a teenage motorcyclist meets a four by four head-on.

In this episode an adventurous pensioner is lost on Ben Nevis in a howling snow storm, and a van driver skids on black ice to end up teetering on the very edge of a motorway bridge.