(19)

(11)

EP 0 389 488 A1

(12)

(43) Date of publication: 03.10.1990 Bulletin 1990/40 (21) Application number: 88908299.0 (22) Date of filing: 29.09.1988

(51) International Patent Classification (IPC):  G08G 1/ 127( . ) (86) International application number: PCT/GB1988/000799 (87) International publication number: WO 1989/003106 (06.04.1989 Gazette 1989/08)

(84) Designated Contracting States: DE FR GB IT NL SE (30) Priority: 29.09.1987 GB 19870022806 (71) Applicant: SPECTRONICS MICRO SYSTEMS LIMITED Bar Hill, Cambridge CB3 8EL (GB)	(72) Inventor: EWEN-SMITH, Bev., M. Quatro Estradas P-8600 Lagos (PT) (74) Representative: Smith, Philip Antony, et al  REDDIE & GROSE 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)