Exit Numbers Workflow.md

Detailed Workflow of adding missing Exit numbers in the USA

Assign an area and verify the exits on the route for missing information

1. Assign a state to yourself in spreadsheet

Assign a highway

1. Open the exit number reference document for your assigned state area. Pick a highway to check and assign it on the spreadsheet to avoid conflict.

2. Open checkautopista2 and zoom to the assigned state. In the search tab (top left corner) click on search in map button to load all the visible highways in the bounding box.

3. Select the assigned highway from the dropdown and click on the download button.

4. Look out for red inner circle for missing exit numbers. Use open in JOSM button to open the node in JOSM

5. Download the data and mapillary layer to locate a signboard around the blue marker in the imagery.

6. If it is confirmed there is no exit number for the motorway_junction add another tag noref=yes to indicate the exit does not have an official reference number.

7. Use combination Mapillary images, DoT documents, and Wikipedia to add exit numbers as ref=* on motorway_junction nodes. Use the custom TMS layer to understand nearby exit numbers+motorways (tms[22]:https://api.mapbox.com/v4/pratikyadav.3b94b1a9/{zoom}/{x}/{y}.png?access_token=pk.eyJ1IjoicHJhdGlreWFkYXYiLCJhIjoiMTA2YWUxNjRkNmFmZGQ4YzAxZWFiNDk0NDM1YjE1YjAifQ.4P6N5dNmA_WQXd3BsJvu5w)

8. Add any highway missing in the highway spreadsheet. Mark the highway done if all exit numbers are mapped/review

Analyzing signboards in mapillary

Look out of Highway sign boards on imagery. They may look something like this-

Places to look for-

• near a motorway_junction
• near start of a motorway_link

Do's and don't

• It is not necessary that exit numbers are sequential. Yoy might find 45 after 41.
• There are some motorway_junction which don't have any associated exit number. Add noref=yes on these nodes.
• In the case of discrepancy between mapillary and DoT document, look out for the recent change in exit numbers on the web. Many states changes/in a process to change the exit numbers.
• Ignore the highway=motorway_junction where the traffic flow is towards the motorway