A constable—
(a)may arrest without warrant the driver of a motor vehicle who within his view commits an offence under section 2 or 3 of this Act unless the driver either gives his name and address or produces for examination his licence to drive a motor vehicle granted under Part III of this Act, and
(b)may arrest without warrant the rider of a cycle who within his view commits an offence under section 28 or 29 of this Act unless the rider gives his name and address.
This section extends only to Scotland.