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Custom Junction Tool

Custom Junction Tool button

The Custom Junction Tool is used to override the RoadRunner automatic junction functionality for advanced cases. It enables the creation of junctions where no overlaps are present. Junctions that are automatically created by RoadRunner are referred to as automatic junctions. These junctions are automatically created, updated, and removed as necessary. Junctions that are manually created by this tool are referred to as locked junctions. These junctions are manually created and must be manually removed. It is sometimes desirable to convert an automatic junction to a locked junction, either to add more roads to the junction or to change the default stop locations.

The default stop location represents the start or end of a junction along a road. It is the location where newly created maneuver roads automatically stop and the default distance where corners begin. The default stop location has a direction that points out from the junction. This direction is used for determining which roads need to be connected by using corners.

Create a Junction Between Roads That Do Not Overlap

  1. Click the Custom Junction Tool button.

  2. Right-click the end of each road that will be part of the junction.

  3. Press Spacebar to create the junction.

Remove a Locked Junction

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. Press Delete.

Note

Removing a locked junction can result in an automatic junction in its place if roads are overlapping.

Convert an Automatic Junction to a Locked Junction

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. In the Attributes Panel, press Convert to Locked Junction.

Convert a Locked Junction to an Automatic Junction

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. In the Attributes Panel, press Convert to Automatic Junction.

Note

A locked junction cannot always be converted to an automatic junction. If no automatic junction is possible, the junction will be removed during conversion.

Add a Road to a Locked Junction

  1. Click the Custom Junction Tool button.

  2. Right-click the end of the road to add to the junction.

  3. Right-click the junction.

  4. Press Spacebar to add the road.

Remove a Road from a Locked Junction

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. Click the Default Stopline of the road that you want to remove.

  4. Press Delete.

Create a Junction Between Two Parallel Roads

  1. Click the Custom Junction Tool button.

  2. Right-click at the start of the junction on one road and then the end of the junction on the same road.

  3. Right-click at the start of the junction on the other road and then the end of the junction on the same road.

  4. Press Spacebar to create the junction. If the corners do not appear correctly, see the Troubleshooting Locked Junctions section.

Merge Two or More Junctions

  1. Click the Custom Junction Tool button.

  2. Right-click each junction to be merged.

  3. Press Spacebar to merge the junctions together.

  4. Click any extraneous default stop lines on the inside of the junction and press Delete.

Create a Junction Along a Single Road

Creating junctions along a single road is useful for creating standalone crosswalks. To create a junction along a single road:

  1. Click the Custom Junction Tool button.

  2. Right-click the road at the start of the junction and at the end of the junction. If you are making a crosswalk, the start and end of the junction roughly correspond to each side of the crosswalk.

  3. Press Spacebar to create the junction. If the junction does not appear correctly, see the Troubleshooting Locked Junctions section.

  4. Optionally, if you are making a crosswalk:

    1. Select the Crosswalk Tool.

    2. Click the outer side of the junction.

    3. Right-click the other side of the junction to create the crosswalk.

Adjust a Default Stop Location

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. If the junction is automatic, convert the junction to locked.

  4. Click and drag the desired stop location.

Change the Direction of a Default Stop Location

  1. Click the Custom Junction Tool button.

  2. Click the desired junction.

  3. Click the desired default stop location.

  4. Press Flip Direction in the Attributes Panel.

Troubleshooting Locked Junctions

RoadRunner attempts to make a reasonable locked junction based on the specified default stop locations, but the software might be unable to determine the necessary corners to make a reasonable junction. Here are a few steps to take if a locked junction's corners are not computed correctly:

  • Check that all default stop locations point outward from the junction. If a default stop location has been placed manually on a road, the initial direction might be flipped.

  • Check that the default stop locations are not too close together. Try dragging the locations farther apart and pressing Sort Rays to redetermine the corners.

  • Try using multiple smaller locked junctions instead of one large one. Remove roads from the junction as necessary.

  • Try using overlaps instead of making the junction manually.