Procedural traffic in less than 3 words - Absolute no brainer !!! (customizable, realistic and fast) So simple even SpongeBob could handle it! (btw your potato notebook will be fine)
Save yourself some time
400 cars with addon - less than 10 seconds
400 cars animated by hand - let me bring calculator - FOREVER
Turbo performance
One car - real time using proxy
Four hundred cars - 30fps with proxy cars
Million and one car - bring a fire extinguisher (everything bellow is fine)