What can undermine a flagger's authority on a worksite?

Answer: B — If you make them think your job is not important, you will not be taken seriously.

Authority on a worksite comes from the perception that the flagger’s job is essential for everyone’s safety. When a flagger is decisive, confident, and signals traffic clearly while being supported by proper procedures and coordination, drivers and coworkers respond with caution and compliance. If people imply that the flagger’s role isn’t important, they’re signaling that the signals and directions don’t matter, so drivers may ignore them and safety can fail. Radios and clear communication reinforce authority by enabling quick, coordinated responses; suggesting the job is unimportant undercuts that trust. The takeaway is that showing the flagger’s role as critical and professional keeps traffic moving safely and reduces the risk of incidents.