Tunnel-Cleaning Machine
Tunnels don't get any rain, but they get plenty of car ex... ...ust, which leaves grime behind. How do you wash a tunnel ? With a truck built especially of that purpose. T... ...arms ending in whirling brushes. See one of these machines in action.[https://youtu.be/YEKPoZI4gAY]...
https://www.neatorama.com/2017/09/30/Tunnel-Cleaning-Machine/
