Speed limit science could redefine how fast you drive affecting your daily drive, but it's not just about safety.

Q: At a freeway on-ramp, is it illegal to merge early by driving across the white lines before the lanes merge, or is it just discouraged? If it’s illegal, what law would you be breaking?

Sure enough, once I started really paying attention to road signs (um, yikes?), I did notice a few stop signs with perfectly ...