User:Abc1357/LG

Lanes

Details on Lanes and how to map them can be found on the Lanes Wazeopedia page. Editors should consider using the Lane Tools script to assist in mapping lanes correctly.

In California, Lanes should be mapped for major intersections where the number of turn lanes deviates from what is expected. In other words, do not map if you can turn right only from the right lane and/or you can turn left only from the left lane, regardless of whether these lanes are dedicated turn lanes or shared lanes.

Intersections where you should map Lanes

• Intersections that have two or more lanes to turn left or right.
• Complex intersections where clarification of which road to take is necessary

• In a # or H junction where there is a U-Turn, even if there is only a single left turn lane.  The addition of Lanes to these intersections combined with lane heuristics enables Waze to announce a U-Turn, rather than a Turn Left, Turn Left
• Use the View and Hear or View Only continue straight overrides where necessary

Special Considerations

At-Grade Connectors

When adding Lanes, please consider whether AGCs are still needed at that intersection.

As an example, the AGC from westbound Walsh Avenue to northbound San Tomas Expressway is not needed. The island is extremely small. The benefits that the AGC was originally meant for, such as advanced announcement of the turn, are not needed.

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What should be done in this situation?

• Remove the AGC and excess Junction Nodes
• Check to ensure Turn Restrictions are correct for the intersection
• Add Lanes, if needed

Compound Guidance

Compound guidance is the concept where a driver should be directed to a specific lane or set of lanes at a prior intersection to ensure that the driver is in position to perform the turn maneuver. Unfortunately, Waze does not yet support compound guidance.

Lane specific guidance

There are intersections where users should be guided to the proper lane in preparation for the next maneuver. Consider a driver going from Crow Canyon Place to I-680 North. There are 2 left turn lanes on Crow Canyon Place. An editor following lane mapping guidance would map that intersection with 2 left turns. A driver unfamiliar with that area could potentially turn using the left lane of the 2 left turn lanes, turn into the left lane and miss the entrance to I-680 North if there is a lot of traffic blocking the movement to the right lanes in the short distance available.

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In order to properly guide the driver, some sort of compound guidance such as Use the right of the two left turn lanes to turn left and then turn right to enter the freeway would be ideal.

Loss and regain of lane between intersections

Another consideration is where two close-by intersections have dedicated turn lanes, but in between the two intersections, a lane is added such that the driver going to the second intersection could mistakenly enter the wrong lane. Consider a driver on Mission Boulevard being guided to northbound I-680. There are 3 full lanes prior to the on-ramp to northbound I-680 with the right lane dedicated to the freeway entrance.

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At the prior on-ramp to southbound I-680, there are also 3 full lanes prior to the on-ramp with the right lane dedicated to the freeway entrance.

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Note that since Lane Guidance is announced about ½ mile for MH (and ¼ mile for mH and lower) prior to the turn instruction, the driver would have heard In ½ mile, use the right lane to turn right to I-680 North Sacramento at around Warm Springs Boulevard, which is 2 signaled intersections prior to the entrance to northbound I-680. There is no signage that the right lane ends until you are almost at the entrance to southbound I-680. A driver unfamiliar with the area, upon seeing or hearing the guidance, would get into the right lane and would not have much distance/time between the last signaled intersection to the entrance of southbound I-680 to change lanes, especially when there is a lot of traffic in the immediate lane to the left.

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In order to properly guide the driver, there are a few possibilities. Waze could delay announcing the Turn instruction to northbound I-680 until the driver is past the entrance to southbound I-680. A more ideal solution would be for Waze to announce In ½ mile, stay in the middle lane and then turn right to I-680 North Sacramento.

What can be done for these situations?

• Lanes should not be mapped at such intersections
• Before adding Lanes to any intersection, review prior intersections prior to ensure adding Lanes at that intersection do not inadvertently cause confusion for the driver
• Place a Map Comment so that future editors can locate these locations if Waze enhances the Lane Guidance feature to make mapping these locations possible. Adding a Map Comment could be used as a notification to current editors that the intersection has been reviewed and Lane Guidance should not be added until such time these enhancements are available.