I think the question is asking for an explanation of how that is possible that some areas are right and some are left within the same country. Does the local government decide (city, state, etc), or is it something else, and why.

Additionally, they seem to be partially color blind, since they can't differentiate the purple from blue.

Edit: Copying my other comment here, based on some light Internet research which may or may not be accurate.

Austria was apparently split based on which part of the country was controlled by Napoleon, and this lasted for quite awhile, though a few sources cite different lengths of time for the mixed driving laws. I wanted to use a local source here but it was paywalled.

Also, apparently Italy and Spain (and Canada?) changed from left side to right side drive in the 1920s, so this probably reflects that change in Europe.