The Tunnel by Andre Ovredal

Adapted from the short story The Tunnel Ahead , The Tunnel is a futuristic suspense thriller/horror. A Norwegian family have spent the afternoon at the beach - where they were allowed one hour in the water - and are now returning to their overpopulated city in their self-driving car via one of the tunnels, the only way in and out of the metropolis. However, the tunnels are also used for population control...