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@DexterLooo I tried lower max vehicles and increase spawn interval a bit, the game becomes more stable. So for anyone tweaking settings, that might be a good tip.
One small thing I've observed: the spawned cars in the highway tend to show up mostly on one side, all going the same direction. Looks a bit unnatural since real roads have traffic flowing both ways. Would be awesome if a future update could balance it out so vehicles spawn more evenly on both directions. Thanks again.

@DexterLooo Thanks for getting back. I just have heap, packfile, resource adjuster and this script, no other traffic spawner. May caused by some high-res mods or high MaxSpawned setting (Now it's 30 vehicles with 200ms spawn interval). I'll reduce the pool and lower MaxSpawned and run a further test.

Awesome script! A real game changer.
Yet hitting a repeatable crash after about 40 minutes of play. Error is Access Violation (0xc0000005) at offset 0x54c54a in GTA5.exe. I have 80-90 add-on vehicles in the pool. Any guidance on what might be causing it or how to troubleshoot would be great.

Much needed script. But getting crashes (Access Violation 0xc0000005) when both this traffic script and Resource Adjuster are running after 20-30 mins playing. Maybe Resource Adjuster changes the game's memory pools and traffic script is still using original addresses to find things, so it ends up grabbing wrong data instead of a real address.