Traffic Event List

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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.

Events

The initial model defines the following event classes:

Class Description
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.

Label F Description
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_EASING Traffic easing
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)
CONGESTION_TRAFFIC_PROBLEM Traffic problem


Events in the DELAY Class

Label F Description
DELAY_CLEARANCE Delays cleared
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

Label Description
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_ENTRY_REOPENED Entry reopened
RESTRICTION_EXIT_BLOCKED <q:int> th exit slip road blocked
RESTRICTION_EXIT_REOPENED Exit reopened
RESTRICTION_INTERMITTENT_CLOSURES Intermittent short term closures
RESTRICTION_OPEN Open
RESTRICTION_RAMP_BLOCKED Ramps blocked
RESTRICTION_RAMP_CLOSED Ramps closed
RESTRICTION_RAMP_REOPENED Ramps reopened
RESTRICTION_REOPENED Reopened
RESTRICTION_ROAD_CLEARED Road cleared
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

Supplementary Information

The initial model defines the following supplementary information classes:

Class Description
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

Label Description
S_PLACE_BRIDGE On bridges
S_PLACE_RAMP On ramps (entry/exit)
S_PLACE_ROADWORKS In the roadworks area
S_PLACE_TUNNEL In tunnels

Supplementary Information in the TENDENCY Class

Label Description
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

Label Description
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