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Depending on the orders they receive from their commanding officers, police may direct traffic during the rush-hour periods and at special events when traffic is unusually heavy. They may patrol public places such as parks, streets, and public gatherings to maintain law and order. Police are sometimes called upon to prevent or break up riots and to act as escorts at funerals, parades, and other public events. They may administer first aid in emergency situations, assist in rescue operations of various kinds, investigate crimes, issue tickets to violators of traffic or parking laws or other regulations, or arrest drunk drivers. Officers in small towns may have to perform all these duties and administrative work as well.