You pass a Flagger Ahead sign and enter the work zone. A flagger in the zone waves you through the intersection while the traffic light ahead shows red. What are you required to do?

The flagger's directions legally override the signal, so obeying the light instead of the wave disobeys the person legally in charge of traffic in the work zone. Applies the everyday rule that a steady red is always absolute, missing that the orange diamond warned of a flagger whose directions outrank the light.

The flagger's wave sends you through on red, so waiting for green idles you against the traffic plan the flagger is running. Treats signal color as the only cue that decides when to move, a habit built for ordinary intersections where no flagger has been posted to take over the light.

The flagger alone carries the authority to send you through, so the wave is enough even when the signal shows red. Treats the flagger and the signal as co-equal authorities that must both agree, the same doubled-up caution that would wait for a red arrow even when a police officer is waving traffic through.