Arrest no, ticket maybe. Depends on lots of things, like the road and expected speed, is it a neighborhood, school, or empty highway. how the officer is feeling. surrounding traffic speed. Also I think the ticket doubles or goes up in price 10+ mph over the limit.

Do police not arrest people for this?

Depends on the city. Some cities are notorious for using speed traps to increase revenue.

From Texas to Ohio, municipalities are using law enforcement to counteract declining tax bases through the aggressive enforcement of fineable offenses such as speeding. A 2019 report estimated that nearly 600 jurisdictions nationwide generate at least 10% of their general fund revenue through fines and forfeitures.

Other municipalities have enacted their own policing-for-profit programs. In Brookside, Alabama, the town of about 1,200 residents saw its revenue increase more than 640% in only two years, according to AL.com, after police began an aggressive traffic stop and ticket-writing campaign. Fines and forfeitures made up almost half of the town's budget.

Some places are sticklers about the speed limit, and other minor offenses. If you’re local, you tend to know where they are, either from word-of-mouth or local news. Most places won’t ticket for going 5 mph over because a lot of judges will just throw the ticket out, especially if you come with a receipt saying you had your speedometer calibrated. In seemingly more and more places, 10 mph over is the norm. Some of that’s due to shrinking police forces. Pretty much everywhere, 20+ mph over is considered reckless driving.

Lol no, you have to be going something like double the speed limit most places to get arrested

You might get a ticket, but almost any judge will throw the ticket out if they write you up for going 5-10 over. Some places will write the ticket anyways in the hopes of making some extra revenue, but generally speaking it’s not a ticket that is worth writing because it’s so easy to get tossed out.