When I took my driving test, in the instruction manual it states if you're driving on a highway and dont see a speed limit anywhere or havent seen one in a while, the predetermined speed limit is 50mph. If you're on small surface roads/neighborhoods it's 25mph. If you're on large streets such as avenues and stuff with like 2+ lanes per side, it's 35mph. I'm sure each State has its own rules but just a thought to keep in mind so you dont get a ticket again lol