What is meant by 'Prima Facie Speed Law'?

The term 'Prima Facie Speed Law' refers to a default speed limit that is enforceable. This means that a specific speed limit is presumed to be reasonable and lawful under normal conditions, unless it can be proven otherwise. In practice, it establishes a baseline speed that drivers must adhere to when no other speed limit signs are posted. For example, if a locality has not established its own speed limit, the prima facie speed law would apply, typically reflecting the general speed deemed safe for that area, often found in state statutes.

This concept serves as a guiding principle for law enforcement when gauging whether a driver is exceeding the lawful speed, thereby providing a measurable standard for traffic regulations. It also indicates that even if no signs are present, a driver can still be held accountable for exceeding the established default speed.

Thus, while there are specific speed limits in residential areas, construction zones, and highways, the essence of the prima facie speed law is that it provides a general, enforceable speed limit that applies universally when no specific limit is indicated.