A secured transportation control network for the automated control of a transportation network, said control network comprising: a distributed set of transportation network management units spread across different functional points of the transportation network, wherein each transportation network management unit is adapted to either monitor or regulate a condition of a respective segment of said transportation network, and wherein two or more transportation network management units communicate with each other to perform coordinate transportation network management in-a coordinated manner; at least one network management unit agent functionally coupled to a respective transportation network management unit and adapted to monitor communications of the respective management unit sent and received by the respective transportation network management unit, wherein information about monitored communications are reported to a behavior monitoring server which is adapted to generate a unique behavior profile for each of one or more transportation network management units based on information derived from reported communications to and from each of the transportation network management units within a context of a status or state of the transportation network; characterized in that a behavior monitoring server adapted to generate a behavior profile for a network management unit based on information provided by an agent is functionally coupled to the network management unit; a communication policy generator to generate for a given at least one transportation network management unit a unique customized communication policy based on a behavior profile of network management units with which the at least one network management unit communicates generated for that given at least one transportation network management unit and at least one other behavior profile for at least one other transportation network management units with which the at least one network-management unit has communicated; and wherein the customized communication policy is sent to a transportation network management unit enforcement agent functionally coupled to the at least one transportation network management unit, wherein the customized communication policy defines how the respective policy enforcement agent responds to different types of messages received by the respective transportation network management unit at different contexts of a status or state of the host transportation network wherein the respective communication policy received by an agent is used by the agent to filter or flag communications not complying with the respective communication policy. a distributed set of transportation network management units spread across different functional points of the transportation network, wherein each transportation network management unit is adapted to either monitor or regulate a condition of a respective segment of said transportation network, and wherein two or more transportation network management units communicate with each other to perform coordinate transportation network management in-a coordinated manner; at least one network management unit agent functionally coupled to a respective transportation network management unit and adapted to monitor communications of the respective management unit sent and received by the respective transportation network management unit, wherein information about monitored communications are reported to a behavior monitoring server which is adapted to generate a unique behavior profile for each of one or more transportation network management units based on information derived from reported communications to and from each of the transportation network management units within a context of a status or state of the transportation network; characterized in that a behavior monitoring server adapted to generate a behavior profile for a network management unit based on information provided by an agent is functionally coupled to the network management unit; a communication policy generator to generate for a given at least one transportation network management unit a unique customized communication policy based on a behavior profile of network management units with which the at least one network management unit communicates generated for that given at least one transportation network management unit and at least one other behavior profile for at least one other transportation network management units with which the at least one network-management unit has communicated; and wherein the customized communication policy is sent to a transportation network management unit enforcement agent functionally coupled to the at least one transportation network management unit, wherein the customized communication policy defines how the respective policy enforcement agent responds to different types of messages received by the respective transportation network management unit at different contexts of a status or state of the host transportation network wherein the respective communication policy received by an agent is used by the agent to filter or flag communications not complying with the respective communication policy.