Navteq classify roads in five different categories:
Does anyone know what these road definitions mean?
I'm guessing that 4th class is unpaved and main road is probably a paved divided limited access highway, but that's just a wild guess.
Other than being buried in page 20 of 38, it still does not address the question. The classifications are those used by the I95 Coalition and Inrix, not Navteq.
Does anyone know what these road definitions mean?...
I know you probably want a definition and I haven't seen the answer exactly as listed here, but in general most mapping programs follow something as:
Limit access (Interstate - Trans Canada Hwy)
Multi lane divided highways
Single lane highways (no physical boundary between opposite lanes
You might find this interesting: http://www.nn4d.com/getDocument.do?docId=3807. It is the Navstreets reference manual. Look at section 6.2.184 Functional Class. In part it reads:
Definition Functional Class defines a hierarchical network used to determine a logical and efficient route for a traveller.
• Functional Class = 1 roads allow for high volume, maximum speed traffic movement between and through major metropolitan areas.
Functional Class = 1 is applied to roads with very few, if any, speed changes. Access to the road is usually controlled.
• Functional Class = 2 roads are used to channel traffic to Functional Class = 1 roads for travel between and through cities in the shortest amount of time.
• Functional Class = 2 is applied to roads with very few, if any speed changes that allow for high volume, high speed traffic movement.
• Functional Class = 3 is applied to roads which interconnect Functional Class = 2 roads and provide a high volume of traffic movement at a lower level of mobility than Functional Class = 2 roads.
• Functional Class = 4 is applied to roads which provide for a high volume of traffic movement at moderate speeds between neighbourhoods. These roads connect with higher functional class roads to collect and distribute traffic between neighbourhoods.
• Functional Class = 5 is applied to roads whose volume and traffic movement are below the level of any functional class. In addition, walkways, truck only roads, bus only roads, and emergency vehicle only roads receive Functional Class = 5.
The following also receive Functional Class = 5:
♦ Access roads, parking lanes, and connections internal to the complex of select POIs in the U.S.
♦ Roads in marginal and illegal settlements in developing countries
• Functional Class = Not Applicable is applied to non-navigable links.
• As a general rule, Functional Class assignments have no direct correlation with other road attributes like speed, controlled access, route type, etc. While in general Functional Class = 1 roads are controlled access this is not always the case, and it is also not the case that all controlled access roads are Functional Class = 1
• The Functional Class network is a hierarchical classification of roads based on reality. Density and pattern of each Functional Class level is influenced by the physical road network that exists in reality. Physical road network density variations between countries and between regions within a country are reflected in the Functional Class network. For example, the density of the road network differs between North American and European countries. Even within the U.S., for instance, density will vary from the East Coast to the West Coast.
• Functional Class = 1, 2, 3, and 4 roads are connected to form a comprehensive road network for navigation of long distance, mid-range and short routes in any given coverage area. For example, long distance routes are often calculated by searching the road network through progressively higher Functional Classes to get to a Level 1 road. The route continues exclusively on Level 1 roads until travel is required through progressively lower Functional Classes in order to reach the destination.
• The lowest Functional Class necessary to produce inter-connectivity is applied to ramps, turn lanes, and intersection internal links.
• When two or more different Functional Class roads connect, the lower functional class is applied to the connecting roads,
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