Thanks for your response! One more thing, that I realize would be a huge change for the game, would be adding yield signs. I think that it would add a whole new challenge to the game, and maybe be introduced in later levels (if some sort of level progression system was implemented), but I do think it would be very fun!
Well I was thinking more about a campaign style, where you could only later play levels once you get at least one star on the level before that, or you could have a system where you would need a total of say like 5 stars on the first 3 levels to gain access to the fourth, or maybe when you get later in the game you unlock more cool traffic signs/resources (like the yield sign if you were to implement that, or just QoL tools)?