Which two types of lights should be positioned on the outside of a curve?

The correct choice indicates that Type C and Type D lights should be positioned on the outside of a curve. This is crucial for ensuring proper visibility and maintaining safety for both the flaggers and the drivers in approaching traffic.

Type C lights typically serve as warning signals that alert drivers of upcoming curves and changes in the roadway. Their positioning on the outside of a curve allows them to be visible to drivers from a distance, giving them adequate time to react to the upcoming turn. Type D lights often provide additional illumination or signaling to enhance visibility further during darker conditions or adverse weather, reinforcing the need for caution as vehicles navigate through the curve.

Overall, this combination is effective because it maximizes the visibility of potential hazards and effectively communicates the necessary alerts to motorists, promoting safer navigation around curves where visibility may be limited. Proper placement of these lights is a fundamental component of traffic management and flagger safety practices.