This police car helped me pass through the tunnel. But probably, tonnels are the worst impression of my trip. most of them are long (up to 4 km), absolutely dark and smoky. Cars attempt overtaking each other even despite the prohibiting signs. One day I've passed through several long tunnels, but after getting in a quite unpleasant overtaking maneuver I decided not to risk more and hiked a small truck. It helped me escape to a less busy road.