No, the speed limit is not always five miles per hour over the posted speed limit. The speed limit refers to the maximum legal speed at which you can drive on a particular road or in a specific area. It is determined by the local authorities and can vary depending on the location, type of road, and other factors.
In many jurisdictions, there are specific guidelines for determining speed limits. These guidelines may consider factors such as road conditions, traffic patterns, proximity to schools or residential areas, and other safety considerations. The posted speed limit is the legal maximum limit for that area, and drivers are expected to adhere to it.
While some jurisdictions may allow a certain tolerance for minor speed deviations, it is generally not a fixed rule that you can always exceed the posted speed limit by five miles per hour. It's important to be aware of and obey the specific speed limits indicated by road signs and local regulations to ensure safe driving and comply with the law.