The 3,150 m long Lefortovo tunnel in Russia, (near Poland) is the longest in-city tunnel in all of Europe. It is nicknamed 'The Tunnel of Death.' See for yourself why. There is a river running over the tunnel and water leaks through in some areas. When the temperature reaches nearly 0°C like it does during the winter in Russia, the road freezes and becomes a sheet of black ice.
The result is the attached video which was taken during a single day with the tunnel surveillance camera. Congratulations to the dual-carriage bus driver -- imagine the passengers in the back! What a ride!
The next time you complain about traffic, remember this video ...  Yikes, Russian engineering! ... or ...  perhaps it's the vodka.