Realigning overlapping routes

Sometimes realignments are performed against routes that overlap with other routes. An overlap occurs when two highways share the same pavement. Realigning one highway does not necessarily impact the overlapping highway. Since events typically reference sections of pavement rather than route designations, you need to think carefully about what happens to your event data when realigning an overlapping route.

You need to decide whether the events will stay with the pavement they are on or move with the new alignment. Esri Roads and Highways provides additional options for determining what happens to events during a realignment when overlapping routes are present. See Realigning a route for information about realigning routes.

  1. Start ArcMap and set up your edit environment for using Roads and Highways.
  2. Use the ArcMap navigation controls to zoom to the location of your realignment.
  3. Set your target LRS Network layer.
  4. Set your edit activity to Realign Route.
  5. Optionally, select a redline feature using the Select Redline Features tool.
    Select a redline for your overlapping route realignment
  6. Select your source geometry using the Select Source Geometry tool.
    Select source geometry for the overlapping route to be realigned
  7. Click the Apply button Apply.
  8. Verify the values on the Realign Route dialog box and click OK.

    Roads and Highways determines that an overlap has occurred and opens the Route Priority dialog box.

    Route Priority dialog box
  9. Use the up and down arrow buttons to list the routes in order of priority.

    The highest priority is given to routes where you want events to snap to. When you realign an overlapping route, you are essentially pulling the route off the existing pavement and putting it somewhere else.

    When the portion of the route you are moving shares pavement with another route, you must tell the system that this route has priority over the realigned route. You may have multiple routes that overlap in different locations along the realignment section. By assigning the priority to the routes, you can tell Roads and Highways which routes to snap to in the presence of other routes.

  10. Click OK.

    The original route is realigned, but the overlapping routes stay where they are.

    Overlapping route after realignment
  11. Verify event behavior.

    Events with snap behavior will remain on the original alignment rather than move to the new alignment, assuming the original alignment has been given priority. The portions of the events that went beyond the overlap section will be split with the portion in the overlap being assigned to the underlying route.

    Events with snap behavior stay on the route with the highest priority