Nice game! At first I didn't understand it very well, but once it clicked, I reached the goal pretty quickly.
The detail I liked most is that the cars aren't just decoration, they're actually the supply chain for everything on the map. It also lets you see which resources are being overproduced, so you know what to build next instead of wasting time.
The only criticisms I had was that the car horns became a bit annoying when there were a lot of them. However, after playing for a while, I realized that was mostly because I was managing the supply chain poorly, so I don't really see it as a problem anymore. If anything, it's actually a nice detail.
The other thing I would mention is that I think there was a bit more potential to explore on the "Countdown" theme. Simply having a counter to reach the goal felt a little straightforward, and I think the theme could have been integrated into the gameplay in more interesting ways. That said, it's just a minor point.
Overall, good game!