A memory module for storing data indicative of a predetermined profile for a traffic signal controller

摘要

A system (1 ) for controlling a traffic signal includes a traffic controller (6) which has a communications interface (8) having a 25-pin RS232 communication port (9) for physically stably engaging with an external memory device in the form of a self-contained and portable memory module (10). Module (10) contains first data (11) indicative of the predetermined profile and second data (12) indicative of the coding of the first data. Controller (6) includes an on-board memory device (15) containing third data (13) and fourth data (14) that are derived from the first data (11) and the second data (12). A processor (16) is responsive to third data (13) to control the sets of traffic lights (3) and (4) in accordance with the predetermined profile, and responsive to third data (13) and the fourth data (14) for selectively raising an alert signal.