What does a solid and broken line mean?

Solid white lines define lanes of traffic going in the same direction, or they show you the location of the shoulder of the road. Broken or “dotted” white lines are used to show the center line between lanes. • Yellow lines show you where traffic is going in different directions.

What does a single solid dividing line mean?

A single or double solid white line dividing traffic lanes going in the same direction cannot be crossed for any reason. On divided highways, a single solid white line will usually be used to indicate the rightmost boundary of the drivable roadway. You should not drive to the right of this line.