There are a number of different road designations in the United States, from highways and freeways to interstates and routes, and it can cause some confusion with different laws and regulations.

Ever wondered how the highway and interstate numbers came to be? What do they even mean if they mean anything at all? Behind those numbered shields displayed on the signs is a mathematical logic grid ...

Beyond the questionable accuracy of even modern maps, none are thought to include all the shaft openings, test pits, entrances and even entire mines that were constructed in New Jersey. Interstate 80 ...

The interstate highway system transformed the U.S. economy and American life in the 20th century. High-speed rail can have a similar effect in the 21st century, reindustrializing and reconnecting ...