You cannot ride a bicycle without a bell or other warning device.

The Law

To protect pedestrians navigating the busy sidewalks of North Dakota's capital, bicycles were required by law to be equipped with a bell or horn. Shouting 'on your left' wasn't considered legally sufficient in the early 20th century. Sirens and whistles, however, were strictly reserved for police and emergency vehicles, leaving cyclists with little chimes to announce their presence.