Difference between revisions of "User:Kartografer/Road types/USA"

From Wazeopedia
(Added information and an image on connecting roads given higher types to preserve continuity.)
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=== {{@|Highways}} ===
 
=== {{@|Highways}} ===
  
A '''highway''' is an arterial road.
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A '''highway''' is an arterial road. In the United States, Waze determines which roads are highways according to an objective standard based on FHWA functional classification and designation within numbered state or federal highway systems, ''regardless of any physical characteristics of the road''. This is helpful, because instead of guessing which roads are more important, editors can rely on the analysis done by government engineers.
  
 
Highways roads are the backbone of the traffic network. They serve a dual purpose:
 
Highways roads are the backbone of the traffic network. They serve a dual purpose:
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*various County (or Parish) Highway systems, in some states
 
*various County (or Parish) Highway systems, in some states
  
Waze's definition of "highways" includes all these, but it also includes other roads that are not necessarily a part of any numbered highway system. In other words, think of the dictionary definition of "highway" ("a main road, esp. one connecting major towns or cities") rather than the legal definition of the term.
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Waze's definition of "highways" includes all these, but it also includes all other roads that are classified as arterial roads under the FHWA Functional Classification maintained by the state governments, even though they may not be part of any numbered highway system.
  
 
Waze distinguishes three classes of highway: {{Freeway}}, {{Major Highway}}, and {{Minor Highway}}.
 
Waze distinguishes three classes of highway: {{Freeway}}, {{Major Highway}}, and {{Minor Highway}}.

Revision as of 20:17, 22 July 2016

Importance of road types link to this section

Road types are important for both routing and map display:

  1. When planning a route, major roads will sometimes get priority over smaller roads.
    • For longer routes, some lower road types will often be ignored outright in favor of higher-type roads.
    • Since freeways are given the highest priority of all, having other high-type roads is necessary to provide viable alternatives to the routing server in case freeways are clogged with traffic.
  2. When viewing the map, more important roads should appear at the far zoom levels. Without proper types, the zoomed out display can be misleading.

The  Freeway  and  Ramp  road types each have their own special rules. The  Major Highway ,  Minor Highway , and  Primary Street  types are designated using a set of minimum criteria, as explained below.

Exceptions

Occasionally, if deemed necessary for proper routing, a particular road's type may be set higher than as prescribed in these rules. If a road has a higher type than set forth in these rules, there may be a reason for it.

Because the freeway exit is signed to the state route at the bottom of the image, and exiting traffic must use the road on the left to reach it, this road has been given the Major Highway type.

One common reason for a road to be set to a higher type is if that road is a connecting road between two roads with higher types. Promotion of a connecting road is only warranted if the road is signed from one road to the other. For example, a freeway exit may be signed as to a particular highway, but the only way to get to that highway from the exit ramps is over a lesser road. Where such connections are supported by signage, the road type of the connecting road should match the lower of the two roads that it connects. This preserves routing continuity and prevents Waze from pruning out valid routes.

In rare cases, a particular road may require a lower type than as prescribed in these rules. Contact your regional coordinator before lowering the type of any road past the bounds of the rules.

Special rules are used to determine the road types of roundabouts and at-grade connectors.

Road types do not affect naming. See Road Naming (USA).

Highways link to this section

A highway is an arterial road. In the United States, Waze determines which roads are highways according to an objective standard based on FHWA functional classification and designation within numbered state or federal highway systems, regardless of any physical characteristics of the road. This is helpful, because instead of guessing which roads are more important, editors can rely on the analysis done by government engineers.

Highways roads are the backbone of the traffic network. They serve a dual purpose:

  • to carry traffic over long distances, from one city to another, and
  • to carry traffic from collector roads to freeways, where applicable.

Several systems of numbered highways exist in the United States:

  • the Interstate Highway System
  • the United States Numbered Highways
  • various State Highway systems
  • various County (or Parish) Highway systems, in some states

Waze's definition of "highways" includes all these, but it also includes all other roads that are classified as arterial roads under the FHWA Functional Classification maintained by the state governments, even though they may not be part of any numbered highway system.

Waze distinguishes three classes of highway:  Freeway ,  Major Highway , and  Minor Highway .

Runway/TaxiwayService road.png link to this section

Airport runways and private airstrips may be mapped using the Runway/Taxiway road type. The Runway/Taxiway type is for display only and must never connect to drivable road segments. If a drivable road and a runway cross, set the elevation of the road below that of the runway and ensure there is no connection. Draw each runway as a single segment and lock it to prevent lower-ranking editors from attaching a road. Do not form junctions where runways cross each other.

Name each runway using the word Runway and the runway designations with the lower number first and a hyphen between runway numbers (e.g., "Runway 16R-34L".) For the "City" field of runway segments, check "None" to avoid any chance of city smudging.

Runways.png

Despite its title, the Runway/Taxiway road type should never be used for an aircraft taxiway because it would render the same as a runway and confuse the display. Taxiways not intended for frequent access by street vehicles should not be mapped at all with any road type. Taxiways that do commonly serve street vehicles as well as aircraft, for example at fly-in communities, may be mapped as Streets provided they remain disconnected from any runway.

Driveways link to this section

Residents of most urban communities have very short driveways between the named road that they live on and the garage or carport on their property. In general these very short segments should not be mapped, because they have no name, would clutter the map in the client app, take a lot of time to draw, and would greatly increase the overall size of the Waze mapping database with very little return.

In the case of very long driveways, it may helpful to a driver to see the driveway mapped on the client app or even necessary for Waze to determine how to reach the destination. In those cases it may be prudent to add a road. See the article on Driveways for more information.