[munch117]

> The other thing that kills me is not using a different color for separating lanes that run in the same direction vs different directions (white vs yellow in the US) How do you know at a glance if a road is one way?

I agree completely, I've lived with it all my life and I don't understand it either. How you know? You don't, always. When in doubt, keep right.

50 years ago my dad had an accident precisely on account of this. He got confused about what stretch of road he was on, changed lanes into oncoming traffic, and hit a truck head on.

Good thing he was driving a Volvo. He bruised his knee.

[gpvos]

In Europe, the lane to your left is in principle always oncoming traffic, unless you see a separate road to your left with a bit of grass in between. Or at least there will be a continuous instead of a dashed line.

[munch117]

That means you have to look in two places, correlate the information and make a deduction. I would prefer a style of line that is immediately recognisable on its own.

[331c8c71]

It's simpler than that, one can only change lanes when they are separated by a dashed line. Solid lines you are not supposed to cross.

[gpvos]

Well, there are bidirectional roads with dashed lines in the middle, so you can overtake, but you should obviously not stay in the lane with oncoming traffic for longer than that. I can see how colours can help there, but in Europe the road situation tends to be clear enough that that isn't necessary.