For this banner, I created three different movie clips of smoke clouds tweening from right to left. As the user scrolls the slider to the right, the three movie clips are chosen randomly and attached to the stage at random coordinates focused around the front tire. The clips are also populated randomly within a range of varying scale.
A timer counts down only when the slider is moved to the right, which triggers the car to speed off and play the rest of the banner. A user idle timer also runs which triggers an auto play to engage inactive users.