https://www.crazyguyonabike.com/pics...P0688.JPG?v=7q

In coal region of China a little west of Xian on TDA trip in 2007. What made that one, and earlier one that day, interesting was a huge traffic jam of backed up truck traffic, coal dust and no lights cycling through the tunnel with the traffic. More complete journal here: https://www.crazyguyonabike.com/doc/..._id=66557&v=7R