I-696 = Macomb international speedway. The only place in Michigan where the state police would pull you over for going lower than the speed limit.
Those speed limit signs are just suggestions, mere “guidelines” more than laws.
Originally from Michigan I found the speed limits were a futile attempt at some form of sane driving. Then moved to Atlanta after a stint in Utah. 80 MPH in rural areas of Utah were awesome. Go 81 and you risk getting pulled over in Southern Utah.
Here in the ATL on I-285 they do have moderated speed limit signs. Trouble is you cannot even reach that speed limit during off hours most of the time since there’s perpetual construction slowing the flow. Traffic stinks and some drivers stink even more.
I should probably use a mouth guard while driving to prevent gnashing my teeth from frustration.