Emergency Response in North America's Highest Mountain Tunnel (11,200ft)

https://youtu.be/GNZSDap2eyk

26 minute video

"I rode along with Colorado Department of Transportation's emergency
crews at the Eisenhower Johnson Memorial Tunnels along Interstate 70.
At 11,200 feet elevation, these tunnels are the highest point on the
U.S. Interstate system and the highest mountain tunnels in North
America."