A speed faster than 70mph on the interstate is it legal?

Answer 1

In some states, cities, and areas it is legal.

In other states, cities, and areas, it is illegal.

Wherever you might be driving on the interstate system, you should look for signs
on the right shoulder of the road with large black numbers on them. Your car's
speedometer should not display a speed higher than the numbers on the last
such sign that you passed.

Answer 2

In the United States, the speed limit on most interstates is typically 70mph, but it can vary by state. Driving above the speed limit is illegal and can result in a traffic violation or ticket. It's important to always follow posted speed limits for safety and to avoid fines or penalties.