At first, I thought it would be annoying to spend so much in a tunnel, but it was fun in the end. There is a sign at each kilometers to show you how many kilometers you have ahead of you, and the temperature goes up until the middle of the tunnel and then it starts to go down slowly, so it's cool to watch too 😊
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I think this would be an experience I would like to have, but I have to wait until it happens😉
Through the tunnels I went through I saw that they have very strong ventilation, I even stopped at the exit of a tunnel (I think it was about 4 km) and the noise made by the cars and the draft inside was infernal.