As we drive along our state and county highways, we take for granted the center yellow lines that help us stay on our side of the road and let us know when we can pass or when we shouldn't. Did you ever wonder how long those lines are or how far it is between lines? Take a guess in feet, for both questions you will find the answers later in this article. Also, just how wide, in inches, do you think the lines are? Meanwhile, here are a few more things about the lines on our roads from the federal Manual on Uniform Traffic Control Devices.