The CCTV pictures show Harvey Owen, 17, Jevon Hirst, 16, Wilf Fitchett, 17, and Hugo Morris, 18, driving through North Wales on Sunday morning towards the mountains.
The bodies of Jevon Hirst, Harvey Owen, Wilf Fitchett and Hugo Morris were found in their crashed silver Ford Fiesta near Snowdonia National Park on Tuesday, having come off the road into the trench.
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Jevon Hirst, Harvey Owen, Wilf Fitchett and Hugo Morris are thought to have stopped a Premier Foods at midday on Sunday, before beginning their journey into the mountains.