Which type of signs are categorized as conventional traffic signs on an airfield?

Conventional traffic signs on an airfield primarily include stop and yield signs. These signs serve critical safety functions by controlling the flow of vehicle traffic in a manner similar to that on public roadways. For example, stop signs mandate that vehicles come to a complete stop before proceeding, thus ensuring that operators check for potential conflicts with other vehicles or aircraft. Yield signs allow vehicles to merge or proceed only when it is safe, promoting a systematic flow of operations in busy airside environments.

While speed limit and warning signs provide important information about the safe operation of vehicles by indicating allowable speeds and alerting drivers to hazards, they do not fall under the category of conventional traffic signs as defined for airside operations. Direction indication signs, although crucial for navigation, aim at guiding vehicles rather than controlling them at intersections. Parking signs, too, serve a different purpose, focusing on the designation and management of parking areas. Therefore, stop and yield signs are classified as conventional traffic signs because they directly impact traffic control and safety at airfield intersections, mirroring their role in everyday road traffic.