4.—(1) An approval of the Secretary of State under and for the purposes of section 20 of the RTOA 1988 (admissibility of measurement of speed by radar) in force immediately before 1st July 1992 shall have effect in relation to an offence alleged to have been committed on or after that date as if it had been given under and for the purposes of subsection (4) of that section(1).
(2) Section 23 of the 1991 Act (speeding offences: admissibility of certain evidence) shall not apply in relation to an offence alleged to have been committed before 1st July 1992.
A device designed or adapted for measuring by radar the speed of motor vehicles is a device within the meaning of section 20 of the Road Traffic Offenders Act 1988 (as amended by the Road Traffic Act 1991) by virtue of the Road Traffic Offenders (Prescribed Devices) Order 1992 (S.I. 1992/1209).