Lack of training has something to do with it. If the reflectors on the road are red STOP!!!.
The backside of freeway reflectors have been red for many decades. This warns you that you are going in the wrong direction
Except that around here the reflectors seem to migrate over the road surface so you occasionally see a red reflector when you are going the correct way. Also over time they get dull, which wouldn't be an issue with proper road maintenance. What happens where I live is that roads are only repainted and markers refreshed when paving occurs. So most of the line markings are barely visible during the day except on newly paved roads.