Coalmine causes bridges on West ia-Pennsylvania …
It is done in what is known as 'longwall mining.' Imagine a huge piece of machinery slowly consuming a layer of coal about 300 feet below the earth's surface. This is done in 'panels' that can stretch over 2 miles. A panel just crossed under I-70, roughly around May 24, 2022. Part 2: Traffic on I-70 isn't for 'construction', It ...
