Design and Implementation of Ramp Meter Controller Based on NTCIP

Ramp Meter Control (RMC) determines both the entrance and exit of ramp in urban expressway and the conditions of ground road traffic which it is associated with ,in order to ensure the "Interoperability" and "Interchangea-bility" between RMC and each unit of ITS system composition .RMC designed in this paper is based on ARM9G20 CPU core board to implement multi-interface control and extension .It follows NTCIP 1207 MIB to build the structure which contains the complete contents of object operation ,to send and receive information message of SNMP between the man-agement center and the ramp meter controller ,and to achieve read and set of objects in the database .The designed RMC realizes corresponding functions of NTCIP 1207 for traffic signal timing control in light groups ,and overcomes obstacles in coordination and communication of different controllers .