We all have a student (or a few) who either read too fast or rush through their other work. It usually means that they haven't done all the steps they need to do or their work is messy or they haven't comprehended what they read.
Speeding tickets are a subtle and quick reminder for teachers to let their students know that they're going too fast.
Laminate*, cut into strips, and pass out to your speedy students as a reminder to sloooooooow down.
*Laminating creates a reusable ticket, while not laminating could be used to see which students are repeat offenders.