Interactive junction instruction algorithm

This is a clickable interactive guide to determine what instruction, if any, will be given at the junction between any 2 segments.

There will eventually be encyclopedia style illustrations for the various configurations to visually describe the setup. This will formatted as a sequence flow through, to cover (hopefully) all variations.

Introduction

Understanding how and which instructions are provided requires first understanding a few concepts.

• This page is discussing the instruction which will be provided by the Waze server (or not provided) when travelling from one segment, through a junction, and onto a second segment.
• How Best Continuations work. Any time the destination segment is the Best Continuation there will not be an instruction provided.

While the illustrations displayed by each question may not represent every possible variation, they do represent the difference between the two options in that question. Please choose the most appropriate answer.

Definitions

• The segment you are on before going through the junction, in other words the segment you are coming from will be referred to as the origin, and corresponds to s-in in the the algorithm text provided by Waze staff.
• The segment you will be on after the junction, in other words the segment you are going to will be referred to as the destination, and corresponds to s-out in the the algorithm text provided by Waze staff.
• Any segments other the destination which leave the junction at an angle less than 44° will be referred to as other branches, and corresponds to s-N, or s-1,2,3,4... in the the algorithm text provided by Waze staff.
• When the beginning portion two segments are directly on top of each other, meaning they both leave the junction at the exact same angle as each other, they will be referred to as an overlapping segment.
• Any road typed in Waze as a Freeway, Major Highway, or Minor Highway, will be referred to in this page as a highway.

Directions

To use this interactive flowchart;

• Start with the first question in The Interactive Algorithm.
• Click on the appropriate answer which best matches your situation. A new question will jump to the top of the screen
• Continue answering the questions until an instruction is displayed at the top of the screen.
• This is the instruction that the Waze server should give when transversing this junction between the two segments you described as the origin and the destination.

The interactive algorithm

Other than the origin and the destination, are there any other segments connected to this junction?

YES

NO => No Instruction

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Are the origin or the destination part of a Roundabout?

YES, see section on Roundabout instructions

NO

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Is the turn angle from the origin to the destination between 44.5° and 135°?

YES

to AGC image

NO, the turn angle is less 44.5°

Turns with angles greater than 135° will follow the same instruction path as 44.5°-135°, but the Waze routing server will penalize this turn, and avoid routing through it.

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Which direction is the turn?

Left => Turn Left

Right => Turn Right

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Are there any other branches with unrestricted turns from the origin?

YES

NO => No Instruction

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Is there more than one (1) other branch?

YES

NO

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Are the two branches (the destination and the other branch) overlapping?

YES => No Instruction

NO

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Is the name of the origin and the destination identical?

YES

NO

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Are the origin and the destination the same road type?

YES

NO

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Are both the name AND the road type of any of the other branches identical to the origin?

YES

NO => No Instruction

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Is there any other branch to the left of this branch?

YES

NO

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Is this an overlapping segment, is it overlapped by any other branch?

YES

NO<

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Are the segments in a right hand traffic country (such as the USA)?

YES => Keep/Stay Left

NO

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Is the origin a highway?

YES

NO

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Is the destination a highway?

YES => Keep/Stay Left

NO => Exit Left

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Is the origin a ramp?

YES

NO => Keep/Stay Left

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Is the destination a highway, or a ramp?

YES => Keep/Stay Left

NO => Exit Left<

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Is the name of any of the other branches identical to the origin?

YES

NO => No Instruction<

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Are the origin and the destination the same road type?

YES

NO

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Is the name of any of the other branches identical to the origin?

YES

NO

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Is the road type of any of the other branches identical to the origin?

YES

NO => No Instruction

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Are the segments in a left hand traffic country (like the UK)?

YES => Keep/Stay Right

NO

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Is the origin a highway?

YES

NO

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Is the destination a highway?

YES => Keep/Stay Right

NO => Exit Right

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Is the origin a ramp?

YES

NO => Keep/Stay Right<

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Is the destination a highway, or a ramp?

YES => Keep/Stay Right

NO => Exit Right

The instructions

No Instruction

There will be No instruction given passing through this junction. This can be caused by several factors including

• Best Continuation
• The instruction would be Continue Straight (this doesn't yet exist in Waze)

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• Certain cases with an overlapping segment

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Turn Right

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Keep/Stay Right

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Exit Right

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NOTE:

• In a left hand traffic country this instruction does not exist, and will instead give a Keep/Stay_Right instruction.
• You will only get an Exit instruction on a turn angle less than 45°, because it is assumed no true exit would have a turn sharper than 45°.

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Turn Left

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Keep/Stay Left

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Exit Left

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NOTE:

• In a right hand traffic country this instruction does not exist, and will instead give a Keep/Stay_Left instruction.
• You will only get an Exit instruction on a turn angle less than 45°, because it is assumed no true exit would have a turn sharper than 45°.

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