(19)
(11) EP 1 830 332 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.06.2008 Bulletin 2008/23

(43) Date of publication A2:
05.09.2007 Bulletin 2007/36

(21) Application number: 07250903.7

(22) Date of filing: 05.03.2007
(51) International Patent Classification (IPC): 
G08G 1/081(2006.01)
G08G 1/097(2006.01)
 G08G 1/095(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 04.03.2006 GB 0604393

(71) Applicant: Hatton Traffic Management Limited
Newcastle Upon Tyne, NE1 3XX (GB)

(72) Inventors:
  • Walker, Malcolm James
    Lichfield S13 6EZ (GB)
  • Taylor, Ian Stuart
    Malvern WR14 3JQ (GB)

(74) Representative: Kinsler, Maureen Catherine et al
Marks & Clerk 19 Royal Exchange Square
Glasgow G1 3AE
Glasgow G1 3AE (GB)

   


(54) Traffic light control system


(57) A traffic light control system comprising a plurality of controllers each for controlling a traffic light signal unit, one of the controllers being a master controller and the other or others slave controllers, wherein the master controller is operable to transmit to each slave controller the required signal state of its associated signal unit and each slave controller is operable to compare the actual signal state of its signal unit with its required state as defined by the last required state received from the master controller and activate a failure condition procedure in the event of a conflict between the actual and the required signal states.







Search report