The tunnel architecture, with its distinct yellow-tiled wall panels and specific emergency exit signage, strongly suggests a Scandinavian country. The driving side is on the right, which is standard for the region. The clean, modern look of the tunnel lighting and the specific blue emergency phone box are characteristic of road infrastructure in Norway. I suspect this is in the Oslo area, given the high density of such tunnels. I am moderately sure of this location.

then: forward

The tunnel architecture remains consistent with Norwegian standards, specifically the E18 or E6 tunnels around Oslo. The yellow wall panels and the specific emergency signage are very common in the capital's underground road network. The vehicles and traffic flow confirm a right-hand driving country in Northern Europe. I am confident this is a tunnel in Oslo, Norway.

then: guess