You have special boosts at your disposal. You can use them during levels to initiate special actions and reach the level goal faster. Here's a brief description of each boost:

Joker (Van)
Joker is a vehicle that changes its color to one of the possible colors from the board. It's priority is the color of the car that would create a match. If a match cannot be created, Joker adopts a color of the car in front of it.

Clown
This boost destroys adjacent elements. Clown explodes after stopping, affecting the following elements: cars, cones, smog, snow, sleeping drivers, wheel clamps, and tarps.

This boost destroys elements in a row or column. Police Car can destroy the following elements on its way: cars, cones, smog, snow, sleeping drivers, wheel clamps, and tarps.

Tow Truck
Tow Truck works a little similarly to a Joker booster, it also chooses and adopts a color of other cars. Then it removes all cars of that color from the board and disappears along with them.
Cars under car covers are also removed if the cars under them are in a selected color.