| automobileClubPatrol | EnumerationLiteral
| 0 | A patrol of an automobile club. |
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| cameraObservation | EnumerationLiteral
| 1 | A camera observation (either still or video camera). |
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| freightVehicleOperator | EnumerationLiteral
| 2 | An operator of freight vehicles. |
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| inductionLoopMonitoringStation | EnumerationLiteral
| 3 | A station dedicated to the monitoring of the road network by processing inductive loop information. |
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| infraredMonitoringStation | EnumerationLiteral
| 4 | A station dedicated to the monitoring of the road network by processing infrared image information. |
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| microwaveMonitoringStation | EnumerationLiteral
| 5 | A station dedicated to the monitoring of the road network by processing microwave information. |
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| mobileTelephoneCaller | EnumerationLiteral
| 6 | A caller using a mobile telephone (who may or may not be on the road network). |
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| nonPoliceEmergencyServicePatrol | EnumerationLiteral
| 7 | Emergency service patrols other than police. |
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| otherInformation | EnumerationLiteral
| 8 | Other sources of information. |
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| otherOfficialVehicle | EnumerationLiteral
| 9 | Personnel from a vehicle belonging to the road operator or authority or any emergency service, including authorised breakdown service organisations. |
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| policePatrol | EnumerationLiteral
| 10 | A police patrol. |
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| privateBreakdownService | EnumerationLiteral
| 11 | A private breakdown service. |
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| publicAndPrivateUtilities | EnumerationLiteral
| 12 | A utility organisation, either public or private. |
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| registeredMotoristObserver | EnumerationLiteral
| 13 | A motorist who is an officially registered observer. |
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| roadAuthorities | EnumerationLiteral
| 14 | A road authority. |
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| roadOperatorPatrol | EnumerationLiteral
| 15 | A patrol of the road operator or authority. |
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| roadsideTelephoneCaller | EnumerationLiteral
| 16 | A caller who is using an emergency roadside telephone. |
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| spotterAircraft | EnumerationLiteral
| 17 | A spotter aircraft of an organisation specifically assigned to the monitoring of the traffic network. |
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| trafficMonitoringStation | EnumerationLiteral
| 18 | A station, usually automatic, dedicated to the monitoring of the road network. |
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| transitOperator | EnumerationLiteral
| 19 | An operator of a transit service, e.g. bus link operator. |
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| vehicleProbeMeasurement | EnumerationLiteral
| 20 | A specially equipped vehicle used to provide measurements. |
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| videoProcessingMonitoringStation | EnumerationLiteral
| 21 | A station dedicated to the monitoring of the road network by processing video image information. |
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