It all depends on the level Chris. Of course there’s the general strategies but to have got the score you have - you must have general mastery over those strategies. If you want me to give you a strategy for getting a higher score on a certain level - then let me know!
I think it's fine as it is now this makes the illusion that you die because you drive to fast and I think the level will be easier if you can see the black lines wich will remove some of the fun ;)