What qualifies as an Official Traffic Control Device?

An Official Traffic Control Device is defined as a sign, signal, or marking that is placed or erected by a public authority to regulate, warn, or guide traffic on public roadways. This means that to qualify as an official device, it must be sanctioned and maintained by a governmental entity, which ensures that it meets specific standards for visibility, design, and purpose.

In this context, the answer is correct because it highlights the importance of official oversight in the provision of traffic control devices. A sign or signal placed by a public body serves to provide clear and standardized guidance to drivers and pedestrians, contributing to the overall safety and efficiency of road transportation. This regulatory framework helps maintain uniformity across different jurisdictions, making it easier for drivers to understand and respond to traffic controls regardless of where they are.

The other options do not meet the criteria for being considered an Official Traffic Control Device. For instance, a speed limit sign placed by a local authority is valid, but it is only a single instance of an official sign. A traffic signal erected by a private citizen lacks the authorization and responsibility of a public body, which disqualifies it from being an official device. Similarly, a road marking not recognized by any authority does not have the necessary legitimacy or regulatory backing