Plenty of people would give anything for your 80fps bad experience . It seems that your CPU can't do more than 80fps with 6 traffic cars.
I would give the lower half of my body to experience your issue although all jokes aside at this point you should look into upgrading ram and cpu if you really want more but you're running the game absolutely flawlessly right now
I get half that with the same amount of cars because of stuttering. Your performance is fine. The stuttering issue gets significantly better with each update so they are working on it.
80 FPS is ok! But if you want higher fps and more cars, I suggest upgrading to at least a 6 or 8-core CPU and 16GB or 32GB of RAM assuming you have an older quad-core Intel Core i5 or an Intel Core i3 or an AMD Ryzen 3 with 8GB of RAM which sounds like the most likely specs. Plus give me your specs and say if I guessed the specs wrong!
my specs are Device name DESKTOP-SD8VLFF Processor Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz 3.19 GHz Installed RAM 16.0 GB Device ID 55B45EC7-C765-479E-97DC-4C9776B05BCA Product ID 00330-80000-00000-AA644 System type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is available for this display gpu is rtx 3060 ti 12gb and ram is at 3000mhz
I'd recommend that you upgrade to an i9-9900 since that has two more cores and 4 more threads and upgrade to 32 GB of RAM since lots of cars require more CPU cores and RAM.