@@@@ Tips @@@@
1: it seems, it is good to Build
a "Round About" at middle of your Base.
2: if you have enough money,
better build "Community Center" without Cycling road
( = skipping Tax).
it has Zero tax, but you can boost workers quickly.
3: Build a Street far from Main Road System,
then Spam 4+ of Garages on it and connet it to Main Road System.
After you confirmed all 4 karts launched and joined the road system, Remove the roads between Garages and the road system.
it works, Because carts don't need to go back to garages.