Noun
The captain of a bicycle racing team, who sets the pace.
(motorcycle club) An experienced rider who organizes and marshals the motorcycle club on the road.
(more generally) One who is in charge of a group while it is travelling or patrolling a road
(figuratively) A leader who steers or directs a group.
(historical) A person who has official responsibility for maintaining a section of road.
Source: en.wiktionary.org