When flaggers are required, each flagger must be properly trained or certified. Ensure the flagger is using proper equipment, correct signals, and can verbally explain the situation to vehicle operators. If there are flaggers at both ends of the project, ensure they have adequate communication devices and that the devices are used properly. The flaggers are vital to the safety of motorists in the work area. If the flaggers are not performing their duties properly, they must be corrected promptly.