How often do traffic regulations in Missouri update?

The frequency of updates to traffic regulations in Missouri is based on legislative sessions, making this the correct choice. This means that any changes or updates to traffic laws can occur whenever the state legislature meets and decides to pass new laws or amend existing ones. Legislative sessions occur annually, but the specific timing and nature of updates depend on various factors, including public safety needs, traffic studies, and changes in societal norms or behaviors.

This approach allows for flexibility in responding to relevant issues or emerging traffic safety concerns, ensuring that the laws remain current and effective. While other options may suggest a regular, predictable schedule for updates, they do not accurately reflect the legislative process, which can be influenced by numerous external factors and is not rigidly timed.