Outrun 2006: Flagman flagging

Well, I've beaten all the novice challenges now, without much difficulty at all - in fact, the only thing that was at all tricky was the final race, on which I continuously got overtaken by five or six cars on the last corner. Hardly fair. I've started on the second lot, which are quite a bit harder, and have also started some of Clarissa's challenges, which you need to unlock by getting to that stage in a continuous race in the first place. I've not unlocked many yet ...