I'm pretty sure that "speed limit + 9mph" refers to the unwritten rule that you are allowed to exceed the speed limit by 9mph and not get a ticket. Cops don't t

I'm pretty sure that "speed limit + 9mph" refers to the unwritten rule that you are allowed to exceed the speed limit by 9mph and not get a ticket. Cops don't typically pull people over for less than 10mph over the limit on the freeway. They are allowed to (and do at times if they have a particular bug in their hat or have a quota to fill) but that is not the norm.