4. Traffic data

Traffic data (S0201-S0208) needs additional requirements in order to work correctly.

• The supervision system uses StatusSubscribe and StatusUpdate to continuously receive traffic data from the TLC using subscriptions.

• starttime is the time stamp of start of measuring. E.g. if a subscription update is sent at 15:05 using a subscription update rate of 300 (5 minutes), starttime would be set to 15.00 and vehicles (S0201) would contain the number of vehicles between 15:00 and 15:05.

• Traffic counting must be made at even time intervals. For instance; if updateRate=300 (every 5 minutes) is set at the status subscription, the traffic counter must start at 15:00:00, 15:05:00, 15:10:00 and so on.

• No initial status update should be sent directly after receiving status subscription. Status updates should only be sent at even time intervals and not contain partial counting, e.g. 15:01-15:03 if updateRate=300

• The traffic counter must not reset its traffic counter after receiving a new subscription request. The traffic counter may only reset its traffic counter at even time intervals.

• Buffering of traffic data during connection interruptions should be possible to enable/disable in the equipment. If buffering is enabled it means that active subscriptions of traffic data (S0201-S0208) should remain active and not be canceled at connection interruption or at reestablishment.

• The traffic data must be buffered according to the time interval as determined by the status subscription if buffering is enabled.