A Speed Limit 200 sign is seen during the world wide unveiling of the new Lamborghini Aventador LP700-4 Roadster at the Miami International Airport (Joe Raedle/Getty Images)

There would be a proven scientific formula used which could see speeds set as high as 75 MPH on New Jersey's interstates and the Garden State Parkway. How fast can you (legally) go on interstates around the country?


 

 

Speed limit map (Insuance Institute For Highway Safety)