4 ms·
I'm not sure about that...the highways they put into are often more than three feet deep all told.
by angersock 10y ago
I'm not sure about that...the highways they put into are often more than three feet deep all told.
- chadgeidel 10y agoIt's highly unlikely (due to cost of materials) that there would be more than 12 inches of concrete on a highway. There would maybe be 3 feet of depth including base material (dirt, gravel, or other engineered fill types). You would only see that depth of concrete on an airport runway or where the aircraft are parked. I can't seem to find anything definitive about US road depths ATM.