The rules are lacking
Ummm.... Firstly, in order to unlock all cars, you need to get Burnout License; which is above A license.
And secondly, for speedrunning in general, most categories for speedrunning would be New Game, or New Save File as default, unless stated otherwise (NG+).
So to answer your question, a new game.
Update to Individual Level rules regarding mod usage
Hey everyone!
We have decided to update the ruleset for individual level runs (Road rules, Bike events, Burning Routes, etc.) to cover use of external mods for quality of life improvements. This is not a change, but rather an adjustment to reflect the way mods currently are being used by the comm
Recent runs
Level: North Rouse Drive Road Rule
Level: Horse Power Online Race
Level: Knot In Hill Online Race
Level: Demolition Derby Online Race
Level: Drag Club Online Race