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Scheduled reconfigurations

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In high-traffic areas, local governing authorities will often give advance notice regarding changes such as the opening of a new highway or interchange, the reconfiguration of a ramp or intersection, or a temporary construction detour over a new roadway or contraflow lane. With careful timing, Waze editors can proactively use this information to schedule routing changes in the area in order to minimize any potential disruptions to navigation. When a reconfiguration is simple enough not to significantly change routing, such as merely moving an exit a couple hundred feet, scheduling the change in WME is not necessary, and the map can simply be updated at the time of the change. However, when a reconfiguration is complex and significantly changes routing for a large number of people, it should be scheduled in advance. This article describes the procedure for implementing scheduled reconfigurations.

Flowchart

Process

Draw new roads

If the reconfiguration date is not yet known

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The new ramp has been drawn at the bottom of the image, as a private road with a restriction for all vehicle types at all dates and times.

Road projects progress in stages through planning, design, earthwork, paving, painting and opening to traffic. Planned roads should not be mapped without any sign of their existence in the real world, but during the construction stages the alignment of future roads becomes visible from aerial imagery. When this occurs the roads can be added to the map. Draw them as private roads so that they can be distinguished from complete, open roads on the map. Create them with the geometry, connections and turns that they are expected to have in their final configuration. Add time-based segment restrictions for all times and vehicle types, in order to fully prevent routing. Since the date when they open is probably not known in the early stages of construction, set the restrictions for all dates. Where new road segments may create forks that trigger unnecessary turn instructions in either the old or new configurations, use turn instruction overrides to prevent instructions from being given.

If the reconfiguration date has been announced

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The new ramp has been drawn at the bottom of the image, and a restriction has been added to it with a turn-instruction override to suppress the unnecessary instruction.

Once the date of a reconfiguration is known, draw and connect any new roads that will be open after the reconfiguration, if they have not been created already during previous construction stages. Advance timing is necessary to allow for a tile update in order to use real-time closures on any road segments with new IDs. Since the date may only be announced a few days in advance, there may only be time for one tile update from when the date is announced to when the reconfiguration occurs. Therefore, set the road type of any new roads to match their final configuration, and make sure to allow all turns for both the old and new configurations. Use time-based segment restrictions on the new segments to prevent routing until the opening day, and set the end date of the restriction to end the day before the opening day. Do not conversely place any time-based restrictions on any currently open roads that will be closed after the reconfiguration, in case the reconfiguration is postponed. As in the previous section, where new road segments may create forks that trigger unnecessary turn instructions in either the old or new configurations, use turn instruction overrides to prevent instructions from being given. If necessary, add a map comment.

Add real-time closures

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An active closure has been set on the new ramp, and a future closure has been set on the old ramp.

After a day or two, and before the change has occurred, check for a tile update. After the tile update, the new segment IDs will have been loaded into the closure database, and real-time closures can be added onto them.

Prevent new routes before reconfiguration

Remove time-based restrictions from the new segments, which will be unnecessary once closures are set. Add closures to new segments from the present time until the expected time that the new route will be open. In order to minimize confusion for drivers, instead of closing all new segments, only close segments that are necessary to prevent routing. This time will need to be adjusted if the time of the reconfiguration is changed.

Create an MTE and prevent old routes after reconfiguration

File:RampEvent.png
A new event is being created in event mode.
File:MTEPush.png
A notification for an event-related closure

Also at this time, if the reconfiguration is still more than 48 hours away, create a major traffic event (MTE) for push messaging to drivers (if Waze determines that enough drivers are affected) and add future closures that will take effect after the reconfiguration under this event. If the reconfiguration will happen in less than 48 hours, there is no need to create an event for the future closures.

  • If the reconfiguration is temporary, set the closures to end whenever traffic is expected to revert to normal, and repeat this step later before continuing to the last two steps, since the reversion will be its own traffic reconfiguration.
  • If the reconfiguration is permanent, set the closures to end two weeks later. This will allow a cushion of time during which to finalize changes to the map.

Creating an event

Zoom in on the location of the reconfiguration and switch WME to event mode from the matrix button in the top left corner of the screen. In the top right corner, click the "Add event" button. Name the new event according to the expected traffic change, e.g. "New I-xx to I-yy ramp," making sure the name is no longer than 25 characters so that it can be saved. Set the category to Construction and the location at the city and state where the change is occurring. Configure the time to start the day before the scheduled reconfiguration and to end after any future closures are expected to end. This is so that a push message will go to drivers just before the change happens, and the future closures can be added to the event. It is not possible to add closures to events if their times fall outside of the event start and end times. If the details of the reconfiguration or road project are available on a website, add the URL to the event. Click save, and return to default mode.

Adding closures and submitting the event

Next, add the future closures, setting their start time according the time announced by the authority in charge of the project. Set their end time to the date of reversion, if temporary, or to two weeks later, if permanent. If the event has been properly configured and saved, once the dates and times for the closures are filled in, it can be selected as an option in the event field. Save the closures, and return to event mode. Select your event and click the Closures tab. If your closures have been added there, click the Submit button. If the event and its closures are submitted at least 48 hours before the event begins, the event will be reviewed by Waze staff, who will determine whether to send a push notification to drivers.

Restrict turns to old, unused roads

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While the closure on the old ramp is still active, the turn to it has been restricted.

After the reconfiguration has occurred, restrict turns to any old roads that are no longer used. This will prevent routing after a tile update, even if the real-time closures on such roads are deleted or expire. Using turn restrictions is necessary, rather than segment restrictions, disconnection or deletion of old roads, because closures must be maintained to prevent routing until the tile update.





Remove closures and clean old roads from the map

The old ramp and unnecessary nodes are being deleted.

After a tile update puts the new turn restrictions into effect, remove real-time closures on old roads. If any intersections are permanently blocked, such as when an interchange replaces an intersection, disconnect the roads that no longer route through the intersection. If any roads are permanently closed and removed from service, never to return again to use, delete them from the map. Also delete unnecessary junction nodes and geometry nodes. After the new configuration has been in service for at least a week, check GPS tracks to see if the new traffic configuration is starting to be recorded, and use it to adjust alignment of the roads accordingly.