Question: What is the purpose of solid white lines, separating traffic moving in the same direction? Example the ones leading up to the Lowry tunnel in Minneapolis. Does it make it illegal to change ...

Question: I enjoy reading your column. I have been driving for a number of years but still get confused as to what all the white road markings mean. I know what the white dashes on a road/highway mean ...

A. Yes, just be careful – for safety and for legal reasons. First, look around for a black and white sign that prohibits you crossing over the line – if none, you can slide over it, says Mitch Smith, ...

Q: Gabriel Vera of La Verne said his city has bike lanes separated by a solid white line from the regular motor vehicle traffic lanes, much like other cities. Vera noted that drivers of motor vehicles ...

Before we expound, let’s let Mike explain himself. “When merging into another lane, sometimes I find myself crossing the white line on the freeway,” he wrote to us here at Traffic Q&A headquarters.

Q A friend of mine was entering the freeway and crossed over the white line to pass a slow-moving truck that was ahead of him. He was pulled over and given a warning for crossing over the white line.