Examine the data behind dynamic speed zones. Learn what safety studies show regarding their effectiveness, limitations, and ...

Wondering if you can legally drive 60 mph on your usual route? We break down Iowa’s new speed limit, affected roads and what ...

If you drive, you frequently see and adhere to traffic signs, especially those related to the speed limit. Why are some of them bigger than others?

The 85th percentile rule is a big part of speed limits in the United States. Here's what the rule is and how it influences ...

While it may not be the case in every state, some states use an orange diamond on top of speed limit signs. Have you noticed it? Here's what they are for.

For the first time decades, Iowa is taking the brakes off its 55 mph speed limit. Gov. Kim Reynolds signed Senate File 378 ...

View of 45 MPH (radar enforced) speed limit sign on palm tree-lined street with cars passing by. - Sanfel/Getty Images As you make your way down the street or highway, you are likely — and hopefully ...