While I have no doubt that you could design a better system to reduce mix up, you are fighting _a ton_ of inertia here. There are, give or take, 1.4 billion drivers around the world and a new system would require those 1.4b people to relearn a skill that is basically muscle memory right now.
Not only would that be a near-impossible task, but it would also likely lead to _more_ accidents in the short term as people mistakenly revert to the “old” way of driving, get confused, and respond incorrectly.
Some systems are just too entrenched to be reasonably altered, even if you can develop an objectively better alternative.
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