AlanOfTheBerg wrote:CBenson wrote:Small Detour Prevention Mechanism
Why the "small" here? To try and differentiate it from "large" detours which are as yet undefined in terms of Waze? I think I'm ok with it, but want a small explanation here. (pun intended)
Waze plans to implement a small detour prevention mechanism to deal with instances where waze calculates that that its a few seconds faster to to continue straight or make a right at an intersection a make a u-turn rather than just turning left. Waze will eliminate such detours if there is under a 30 sec difference in the routes.
Waze routing will not present routes over a detour off a highway/freeway and back on that same highway/freeway when all of the following conditions are met:
Waze routing will heavily penalize routes over a detour off a highway/freeway and back on that same highway/freeway when all of the following conditions are met:
Waze routing is intended to work were the Waze map has been carefully corrected by a corp of dedicated editors and where the map is imported without editor correction. For this reason, Waze routing is penalty based. That is, the various segment properties and junction node properties that restrict routes are applied as a routing penalty. For example, a turn restriction indicated by the red turn restriction arrow does not prohibit the turn, rather the turn restriction applies a high penalty to any route through the turn. This penalty based routing system permits routing to a point on street where all turns onto the street are set as restricted. Thus, providing for some routing in areas that have not been edited carefully.
The following segment properties cause routing penalties:
- Turn restrictions (and time based turn restrictions during the designated time for the designated vehicle type)
- One-way roads against the designated direction of travel (and time based segment restrictions for the designated time for the designated vehicle type)
- Non-drivable road types (Walking Trail, Pedestrian Boardwalk, Stairway, Railroad and Runway/Taxiway
- Toll roads for clients with avoid toll roads selected
- Dirt road/4x4 Trail for clients with avoid dirt roads selected
- Parking lot roads and private roads when transitioning to another road type
Other routing penalties are based on road configurations. For example, Waze will penalize a route with two left turns in less than 15 meters in right hand drive jurisdictions or with two right turns in 15 meters in left hand drive jurisdictions. Waze also penalizes some routes that leave a highway or freeway only to immediately return to the same freeway or highway.
If a segment should never be used for routing, it should not be connected to the road network. For example, Waze may route over railroad, walking trail or stairway segments connected to the road network if conditions are such that the penalized route is still found to be the best route. This is common where there are no alternative routes, such as when Waze finds that the origin or destination is on the penalized segment.
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