Is There a Chapter for Color Blind People?

There's a percentage of men that have trouble seeing the differences between green and red. You can use positional cues such as stoplights to help people see what they are even if they're color blind. If you really insist on using green for one line and red for another, you can,. you can have one as a solid line and the other one as a dotted or dashed line - so it makes it easier for everybody to see the different lines.