Originally Posted By HSobstad
I was driving 8% uphill in a tunnel at about 80 km/h. Temperature in tunnel about 15 degrees celsius. Quite a surprise that the exhaust is glowing redhot as I was far from pushing the throttle.
Have added a pickture as a file (if I succeded).

This springs to mind!

M3W5sp 2015, MSCC, MTWC, Oxon UK