The yellow road marking is characteristic of Japan. The sign above the tunnel entrance features Japanese characters, confirming the location. The architecture and the specific style of the tunnel infrastructure strongly suggest an urban setting in Japan. I am fairly confident this is a Japanese city.

Country: Japan
City: Tokyo
Confidence: 70%

then: forward

The road markings and the tunnel structure are definitively Japanese. The sign hanging above the tunnel entrance shows "カーブ" (Curve), which is common in Japanese road signage. The overall design of the concrete tunnel and the urban surroundings point toward a major metropolitan area. I am confident this is located in the Tokyo area.

Country: Japan
City: Tokyo
Confidence: 85%

then: guess