Rekin Racer Board Game

This is a racing game My daughter (age 7) and I (age 35) came up with.
We've iterated the rules until the game was fun by using my 5 year old son as a guinea pig.
I've enclosed a *.pdf with a set of rules for how we like to play. I've tried to make this as complete as possible.
The game is turn based and a full game can be completed in 15 min or take as long as 45 min. depending on the number of laps you do.
Any and all suggestions are welcome.