My developed game for this tutorial is not really a game, the player is just watching the cross road. The view can be controlled by the mouse. 

Vehicles (truck, mid-sedan, bus, taxi, truck, airplane and so on) are spawn automatically and randomly, then each vehicle goes to each target spot randomly selected.

Other than OOP, following techniques are used in this video.

Coroutine, Scene Change, Data Persistent between scenes, Changing angle and Zoom In/Out of main camera, Nav Mesh Agent, Audio Source handling etc.