The allowable speed limit on the interstate, like any road, is determined by local traffic laws and regulations. The specific speed limit varies depending on the country, state, or region you are in.
In many places, exceeding the speed limit even by a small margin can result in a traffic violation and lead to fines, points on your driver's license, or other penalties. Generally, the speed limit is set to ensure the safety of all road users and to minimize the risk of accidents.
It is essential to obey the posted speed limits and drive at a safe and reasonable speed, considering road conditions, weather, and traffic flow. Always check the local laws and speed limits in the area where you are driving to avoid any legal consequences and, more importantly, to ensure the safety of yourself and others on the road.