Traffic info comes from many sources:
Incident reports: ’Incidents’ can be anything from jams on motorways to planned roadworks. The reports often come from local authorities, such as the police or a traffic management agency.
Traffic sensors: Many metropolitan areas have traffic flow sensors that measure the current average speeds on motorways and major roads.
People like you: Incident reports are timely, but sensors focus mainly on major motorways. So we also rely on the wisdom of local people to help us get a picture of the traffic situation throughout the city. People who use HERE Drive or HERE Drive+ can also help by providing anonymous info about their current travel speed.
Historic info: If sensors aren’t giving us enough info, we can make relatively good assumptions about current traffic speeds based on historic info. Many city streets have very regular patterns, such as a traffic jam most mornings and fast-flowing traffic at night.
Modelling: In many cases, it’s possible to infer the overall traffic situation from partial info. If there’s a heavy jam on a major road, for example, the adjoining side roads are probably also crowded.
http://www.nokia.com/us-en/support/faq/?action=singleTopic&topic=FA141581
Incident reports: ’Incidents’ can be anything from jams on motorways to planned roadworks. The reports often come from local authorities, such as the police or a traffic management agency.
Traffic sensors: Many metropolitan areas have traffic flow sensors that measure the current average speeds on motorways and major roads.
People like you: Incident reports are timely, but sensors focus mainly on major motorways. So we also rely on the wisdom of local people to help us get a picture of the traffic situation throughout the city. People who use HERE Drive or HERE Drive+ can also help by providing anonymous info about their current travel speed.
Historic info: If sensors aren’t giving us enough info, we can make relatively good assumptions about current traffic speeds based on historic info. Many city streets have very regular patterns, such as a traffic jam most mornings and fast-flowing traffic at night.
Modelling: In many cases, it’s possible to infer the overall traffic situation from partial info. If there’s a heavy jam on a major road, for example, the adjoining side roads are probably also crowded.
http://www.nokia.com/us-en/support/faq/?action=singleTopic&topic=FA141581
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