Traffic Event List
This is a list of events and Supplementary Information items to be used in conjunction with the proposed Traffic Data Model. They are intended to be capable of expressing any TMC event but without the redundancies present in TMC. The current list includes only a subset of these, namely those which can be meaningfully represented in Navit.
The initial model defines the following event classes:
|CONGESTION||Traffic congestion, typically indicating the approximate speed|
|DELAY||Delays (not necessarily related to road traffic), typically indicating the amount of extra waiting time|
|RESTRICTION||Temporary traffic restrictions, such as road or lane closures or size, weight or access restrictions|
In the following tables, the F column (where present) marks events which can only be used in messages whose forecast attribute is true.
Text in angle brackets <> refers to a quantifier, speed or length of route attribute which is commonly used with the event. Such values are always optional.
Events in the CONGESTION Class
This class has different event types for different degrees of congestion, giving an indication of average speed:
- Heavy traffic, traffic [much] heavier than normal, (ES: tráfico verde, DE: reger Verkehr, [sehr viel] dichterer Verkehr als normal): Road is close to saturation. Ability to change lanes is somewhat restricted but average speed is close to the posted limit.
- Slow traffic (ES: tráfico amarillo, DE: dichter Verkehr): Capacity of the road is reached. Speed may vary rapidly and rarely reaches normal speed. Average speed is significantly lower than the posted limit but traffic is still moving.
- Queue (ES: tráfico rojo, DE: stockender Verkehr): Average speed 10–30 km/h.
- Stationary traffic (ES: tráfico rojo, DE: Stau): Average speed is less than 10 km/h.
- Long queues (ES: tráfico retenido, DE: lange Staus): Significant periods of standstill in which drivers turn off their engines and some leave their vehicles.
- Congestion (ES: congestión, DE: Verkehrsstörung): Generic category covering all of the previous four. Speed is significantly lower than the posted limit, anywhere between steadily moving traffic and long standstills. This event should be used when no accurate quantification is possible (as in the case of drivers observing a congestion without being in it, typically in the opposite direction of a dual-carriageway road).
If an explicit speed attribute is given, it takes precedence over the speed implied by the event. However, sources should keep the event consistent with the reported speed.
|CONGESTION_CLEARED||Traffic congestion cleared|
|CONGESTION_FORECAST_WITHDRAWN||F||Traffic congestion forecast withdrawn|
|CONGESTION_HEAVY_TRAFFIC||Heavy traffic with average speeds of <speed>|
|CONGESTION_LONG_QUEUE||Long queues with average speeds of <speed>|
|CONGESTION_NONE||No problems to report|
|CONGESTION_NORMAL_TRAFFIC||Traffic has returned to normal|
|CONGESTION_QUEUE||Queuing traffic with average speeds of <speed>|
|CONGESTION_QUEUE_LIKELY||Danger of queuing traffic with average speeds of <speed>|
|CONGESTION_SLOW_TRAFFIC||Slow traffic with average speeds of <speed>|
|CONGESTION_STATIONARY_TRAFFIC||Stationary traffic (frequent standstills)|
|CONGESTION_STATIONARY_TRAFFIC_LIKELY||Danger of stationary traffic|
|CONGESTION_TRAFFIC_BUILDING_UP||Traffic building up with average speeds of <speed>|
|CONGESTION_TRAFFIC_CONGESTION||Traffic congestion with average speeds of <speed>|
|CONGESTION_TRAFFIC_FLOWING_FREELY||Traffic flowing freely with average speeds of <speed>|
|CONGESTION_TRAFFIC_HEAVIER_THAN_NORMAL||Traffic heavier than normal with average speeds of <speed>|
|CONGESTION_TRAFFIC_LIGHTER_THAN_NORMAL||Traffic lighter than normal with average speeds of <speed>|
|CONGESTION_TRAFFIC_MUCH_HEAVIER_THAN_NORMAL||Traffic very much heavier than normal with average speeds of <speed> (increased density but no significant decrease in speed)|
Events in the DELAY Class
|DELAY_DELAY||Delays up to <q:timespan>|
|DELAY_DELAY_POSSIBLE||F||Delays up to <q:timespan> possible|
|DELAY_FORECAST_WITHDRAWN||F||Delay forecast withdrawn|
|DELAY_LONG_DELAY||Long delays up to <q:timespan>|
|DELAY_SEVERAL_HOURS||Delays of several hours|
|DELAY_UNCERTAIN_DURATION||Delays of uncertain duration|
|DELAY_VERY_LONG_DELAY||Very long delays up to <q:timespan>|
Events in the RESTRICTION Class
|RESTRICTION_ACCESS_RESTRICTIONS_LIFTED||Traffic restrictions lifted: reopened for all traffic, other restrictions (overtaking etc.) remain in place|
|RESTRICTION_ALL_CARRIAGEWAYS_CLEARED||All carriageways cleared|
|RESTRICTION_ALL_CARRIAGEWAYS_REOPENED||All carriageways reopened|
|RESTRICTION_BATCH_SERVICE||Batch service (to limit the amount of traffic passing through a section, unlike single alternate line traffic)|
|RESTRICTION_BLOCKED||Blocked (refers to the entire road; separate codes exist for blockages of individual lanes or carriageways)|
|RESTRICTION_BLOCKED_AHEAD||Blocked ahead (at a point beyond the indicated location)|
|RESTRICTION_CARRIAGEWAY_BLOCKED||Carriageway blocked (main carriageway, unless otherwise indicated in supplementary information)|
|RESTRICTION_CARRIAGEWAY_CLOSED||Carriageway closed (main carriageway, unless otherwise indicated in supplementary information)|
|RESTRICTION_CLOSED||Closed until <q:time> (refers to the entire road; separate codes exist for closures of individual lanes or carriageways)|
|RESTRICTION_CLOSED_AHEAD||Closed ahead (at a point beyond the indicated location)|
|RESTRICTION_ENTRY_BLOCKED||<q:int> th entry slip road blocked|
|RESTRICTION_EXIT_BLOCKED||<q:int> th exit slip road blocked|
|RESTRICTION_INTERMITTENT_CLOSURES||Intermittent short term closures|
|RESTRICTION_REDUCED_LANES||Carriageway reduced from <q:ints> to <q:ints> lanes (<q:ints> can be omitted)|
|RESTRICTION_SINGLE_ALTERNATE_LINE_TRAFFIC||Single alternate line traffic (because the affected stretch of road can only be used in one direction at a time, different from batch service)|
|RESTRICTION_SPEED_LIMIT||Speed limit <speed> in force|
|RESTRICTION_SPEED_LIMIT_LIFTED||Speed limit lifted|
The initial model defines the following supplementary information classes:
|PLACE||Qualifiers specifying the place(s) to which the event refers|
|TENDENCY||Traffic density development|
|VEHICLE||Specifies categories of vehicles to which the event applies|
Supplementary Information in the PLACE Class
|S_PLACE_RAMP||On ramps (entry/exit)|
|S_PLACE_ROADWORKS||In the roadworks area|
Supplementary Information in the TENDENCY Class
|S_TENDENCY_QUEUE_DECREASING||Traffic queue length decreasing at an average rate of <q:speed>|
|S_TENDENCY_QUEUE_INCREASING||Traffic queue length increasing at an average rate of <q:speed>|
Supplementary Information in the VEHICLE Class
|S_VEHICLE_ALL||For all vehicles|
|S_VEHICLE_BUS||For buses only|
|S_VEHICLE_CAR||For cars only|
|S_VEHICLE_CAR_WITH_CARAVAN||For cars with caravans only|
|S_VEHICLE_CAR_WITH_TRAILER||For cars with trailers only|
|S_VEHICLE_HAZMAT||For hazardous loads only|
|S_VEHICLE_HGV||For heavy trucks only|
|S_VEHICLE_MOTOR||For all motor vehicles|
|S_VEHICLE_WITH_TRAILER||For vehicles with trailers only|