When the U.S. started creating highways connecting the nation, interstates were identified with a logical numbering scheme. CGP Grey looks back at the rationale behind the numbers which have since become cluttered with intrastate interstates, bypasses, beltways, spurs, and exception cases to confuse matters.
Potholed roads can be a major annoyance, or in severe cases, they can cause vehicle damage or accidents. Why is it that with all of the advancements in materials science, we still get roads with giant divots? Grady Hillhouse of Practical Engineering explains the uphill battle faced by transportation departments around the globe.