Time to learn about traffic lanes. Let's go over what each of the lines on the road means so you'll know when you may and may not cross over 'em into another lane of traffic:

Broken Yellow Lines

If they're broken, shouldn't somebody fix 'em? You know, sometimes you're too literal for your own good. They're not really broken—let's call them dotted lines, if you prefer. 

If you're traveling alongside a dotted yellow line, you may cross over it into the neighboring lane in order to pass the vehicle in front of you, as long as you've checked to make sure that there's no oncoming traffic in that lane. If you forget to check and just assume you're good to go because there's a dotted line, it may be you who winds up broken. 

Double Solid Yellow Lines

Unlike the broken yellow line, you should never cross over one of these to pass a slow moving vehicle. However, you can cross these to turn left into or from an alley, private road, or driveway. Why the extra line, you ask? Um, it's a bonus line. Just accept it.

Single Solid Yellow Lines

You'll find these lines in the middle of a two-way road. Traffic moves in one direction on one side of the line and moves in the opposite direction on the other side. In short, don't cross over one of these babies unless you have a dotted line on your side, indicating it's safe to pass from your side. Or unless you're a crash-test dummy and can survive a high-speed impact.

Solid White Lines

A solid line indicates that you may not change lanes, even though a white line indicates that traffic in those lanes is moving in a similar direction. On a one-way street, for example.

Broken White Lines

Just like the other white lines above, these mean that traffic in the neighboring lanes is moving in the same direction that you are, but they're reserved for streets where there are two or more such lanes.

Edge Markings

This is a single line—A) white and on the right side of two-way and one-way roads and B) yellow on the left side of one-way roads—that marks the edge of the road. We wouldn't advise crossing these since, you know, there isn't any more road beyond it.

Arrows

White arrows are painted on some highway lanes to help guide drivers into the proper lanes for turns and through traffic. It's usually best to consider these arrows more than mere suggestions.

Stop Lines

White stop lines are often painted at intersections where traffic signs or signals are present to denote where you should stop your vehicle. If no lines are present, vehicles must stop before the crosswalk.