What shape is typically used for road signs that warn of hazards?

Answer: C — Triangular

The triangular shape is typically used for road signs that warn of hazards because it effectively draws attention and conveys urgency. The pointed end at the bottom of the triangle tends to direct the driver's focus upward towards the message of the sign. This design universally indicates caution, prompting drivers to be alert to potential dangers such as yield situations, sharp turns, or pedestrian crossings. The other shapes such as hexagonal and octagonal have distinct uses—octagonal is exclusively utilized for stop signs—while rectangular signs often convey information or regulations rather than warnings. Thus, the triangular design stands out as the preferred shape for hazard warnings, enhancing safety on the road.