Right, equal protection. For example, 2 people who make wildly different sums of money every day both get pulled over for speeding by the same amount, and both of them have to pay what it takes them say 3 days to earn. That way the richer guy doesn't laugh it off while the poorer guy gets evicted. Equal protection.
I've got no problem with that as long as we also apply it to taxes. Drop all deductions and charge everyone the same percentage of their income for taxes. Equal taxation.