The course marshals ensure that all required emergency equipment and vehicles (fire trucks, ambulances, wreckers etc.) are in place and ready to respond to an incident at a moment's notice. They are to give consistent information to drivers with racing flags and signals; assess the track surface condition; observe competitors for driving behavior and their cars' mechanical condition; help drivers and others in an incident; and communicate information to the stewards who are in charge of the event and rely on the accuracy of the workers' reports to make correct decisions.