“Hours of work” means the time during a workweek that an individual employed by an employer is required by the employer to be on the employer's premises, on duty, or at a prescribed workplace. Meal periods are included in computing hours of work if the individual is required to perform any duties during the meal period. Travel time is included in computing hours of work if the individual: Travels during regular work hours; Travels from one worksite to another; or Is called out after work hours in emergency situations.