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.

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
CONGESTION_LONG_QUEUE		Long queues with average speeds of
CONGESTION_NONE		No problems to report
CONGESTION_NORMAL_TRAFFIC		Traffic has returned to normal
CONGESTION_QUEUE		Queuing traffic with average speeds of
CONGESTION_QUEUE_LIKELY		Danger of queuing traffic with average speeds of
CONGESTION_SLOW_TRAFFIC		Slow traffic with average speeds of
CONGESTION_STATIONARY_TRAFFIC		Stationary traffic (frequent standstills)
CONGEST ION_STATIONARY_TRAFFIC_LIKELY		Danger of stationary traffic
C ONGESTION_TRAFFIC_BUILDING_UP		Traffic building up with average speeds of
CONGESTION_TRAFFIC_CONGESTION		Traffic congestion with average speeds of
CONGESTION_TRAFFIC_EASING		Traffic easing
CONG ESTION_TRAFFIC_FLOWING_FREELY		Traffic flowing freely with average speeds of
CONGESTIO N_TRAFFIC_HEAVIER_THAN_NORMAL		Traffic heavier than normal with average speeds of
CONGESTIO N_TRAFFIC_LIGHTER_THAN_NORMAL		Traffic lighter than normal with average speeds of
CONGESTION_TRA FFIC_MUCH_HEAVIER_THAN_NORMAL		Traffic very much heavier than normal with average speeds of (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
DELAY_DELAY_POSSIBLE	F	Delays up to possible
DELAY_FORECAST_WITHDRAWN	F	Delay forecast withdrawn
DELAY_LONG_DELAY		Long delays up to
DELAY_SEVERAL_HOURS		Delays of several hours
DELAY_UNCERTAIN_DURATION		Delays of uncertain duration
DELAY_VERY_LONG_DELAY		Very long delays up to

Events in the RESTRICTION Class

Label	Description
RESTRI CTION_ACCESS_RESTRICTIONS_LIFTED	Traffic restrictions lifted: reopened for all traffic, other restrictions (overtaking etc.) remain in place
REST RICTION_ALL_CARRIAGEWAYS_CLEARED	All carriageways cleared
RESTR ICTION_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 (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_CONTRAFLOW	Contraflow
RESTRICTION_ENTRY_BLOCKED	th entry slip road blocked
RESTRICTION_ENTRY_REOPENED	Entry reopened
RESTRICTION_EXIT_BLOCKED	th exit slip road blocked
RESTRICTION_EXIT_REOPENED	Exit reopened
R ESTRICTION_INTERMITTENT_CLOSURES	Intermittent short term closures
RESTRICTION_LANE_BLOCKED	Lanes blocked
RESTRICTION_LANE_CLOSED	Lanes closed
RESTRICTION_OPEN	Open
RESTRICTION_RAMP_BLOCKED	Ramps blocked
RESTRICTION_RAMP_CLOSED	Ramps closed
RESTRICTION_RAMP_REOPENED	Ramps reopened
RESTRICTION_REDUCED_LANES	Carriageway reduced from <q:ints[1]> to <q:ints[0]> lanes (<q:ints[1]> can be omitted)
RESTRICTION_REOPENED	Reopened
RESTRICTION_ROAD_CLEARED	Road cleared
RESTRICTI ON_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 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
S_TENDENCY_QUEUE_INCREASING	Traffic queue length increasing at an average rate of

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