The dice are only rolled to check if you take damage. They are always number 1-6 and you also have 2 white coasting dice without numbers and 3 red break dice without numbers.
Each of these dice have a number of blank faces and „oopsie triangle“ faces, roll three triangles and you lose control of the car.
You can choose to roll dice all together for „flat out“ which gives you „focus points“ or you can roll each dice separately starting at the first you placed which means you can stop at any time when you have 2 triangle faces. You can use focus points to skip rolling a die.
When you crash at speeds higher than 1 or 2 you can take damage and lose dice.