We've already seen that the full action space is quite large (in the order of 
). You may have played video games where you only used a joystick with four arrow buttons or the arrow keys on a keyboard to control the speed and heading (the direction in which the car is pointed) to drive, so why can't we ask the agent to control the car in a similar way here? Well, that is the idea behind discretizing the action space. Although we won't be able to have precise control over the car, we can make sure that the discretized space gives us good control in a simulation environment.
Let's begin by using the similar convention ...
