The Role of Flaggers, Rumble Strips, and Guardrails

They discuss the roles of a flagger, rumble strips, and guardrails on the road. They explain that a flagger is a person who stands in the middle of the road at construction sites to direct traffic. They also mention rumble strips, which are placed on the side of highways to prevent drivers from falling asleep at the wheel. Finally, they mention guardrails as a safety measure to stop vehicles from going off the road.