24Restriction of carriage of persons on bicycles
(1)Not more than one person may be carried on a road on a bicycle not propelled by mechanical power unless it is constructed or adapted for the carriage of more than one person.
(2)In this section—
(a)references to a person carried on a bicycle include references to a person riding the bicycle, and
(b)“road” includes bridleway.
(3)If a person is carried on a bicycle in contravention of subsection (1) above, each of the persons carried is guilty of an offence.