The next time you see the dotted line, you'll know exactly what it's doing there.

COLUMBUS, Ohio, Feb. 3 (UPI) -- People underestimate the length of the white dashed lines painted down the middle of a road indicating that many drive too fast, a U. S. researcher said. Study leader ...

Take a guess — how long are the dashed lines that are painted down the middle of a road? If you’re like most people, you answered, “Two feet.” The real answer is 10 feet. That’s the federal guideline ...