12/31/2023 0 Comments Detours off road![]() As of December 2017, this is done with a full continuity check, meaning all segments of the alternate route must have both road type group and street name continuity with the bracketing segments. Continuity: The entire direct route should have street name continuity and road type group continuity.Existence: There must be a different way to go - an alternate route - connecting the freeway/highway bracketing segments, which does not use any of the segments in the detour.Direct route: A direct route is an alternate route that meets the criteria below:.Maximum length: The possible detour must be shorter than the threshold length as shown in the table below for the road type group of the bracketing segments.Minimum length: The possible detour must be more than one segment long.This segment must have a different road type group than the highway segment just after the detour (AKA 2nd bracketing segment). As of February 2018 only the last segment of the detour is checked. Road type group discontinuity: There must be a break in road type group between the detour and the bracketing segments.This segment must not share any street names with the highway segment just after the detour (AKA 2nd bracketing segment). Street name discontinuity: There must be a break in the street name continuity between the detour and the bracketing segments.Preventable detour: A preventable detour is a possible detour that meets all of these criteria:.The road type group of these segments determines the maximum length of detour for which BDP will be applied. These segments must also be from the same road type group as shown in the table below. Either segment may have the shared street name as either a primary or an alternate name. Bracketing segments (segment immediately before and immediately after the detour): The freeway/highway bracketing segments must share at least one street name among their primary and alternate names (city names are not required to match).Here are the specific checks that Waze makes: If a direct route is found, then Waze will apply the big detour prevention (BDP) penalty to the preventable detour favoring the direct route. If a route leaves a highway (based on road group type) to one or more segments whose road type is not in the same road type group as the highway, only to re-enter that same highway, Waze will look for alternate routes that get to that same point try to find a direct route. If a detour being examined passes the checks listed below, we'll call it a preventable detour. Waze does not consider how many 'turn.', 'keep.', or 'exit.' instructions are issued on any of the paths it checks for detour prevention. It also checks that there exists an alternate route that is direct - the direct route must have street name continuity and road type group continuity (see details below). It checks the length of the detour, makes sure the road type group changes, and that the street name is not continuous with the highway the route detours from. Waze makes a few checks on an off-highway detour to see if it should be prevented. Street name discontinuity occurs when one or more of the segments in this continuous set does not share the street name shared by all the other segments. The city name can be different, and it will still be considered continuous. For the purposes of detour prevention, only the name of the street itself must match. It doesn't matter whether the street name is found as a primary or alternate name on any of the segments, as long as it is present in each. Street name continuity When a set of continuous segments all share a street name, there is street name continuity. Road type group discontinuity occurs when one of the segments in the set of continuous segments belongs to a different road type group. Road type group continuity When a set of continuous segments all belong to the same road type group (see table below), there is road type group continuity. ![]() Alternate route What Waze compares a route to - when evaluating a detour route, the direct route is the evaluated alternative. Detour Any route used in place of the direct route. For example, a route that stays on the same freeway from point A to point B. The big detour prevention (BDP) is a penalty meant to keep Waze from telling you to detour off a highway and then get right back on it unless it saves you enough time to be "worth it" - for example, if traffic is really slow on the "direct" route.ĭirect route The continuous route most users would expect.
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