How to Update a Road Speed Limit in OpenStreetMap
Introduction
If you notice that a road's posted speed limit is incorrect in OpenStreetMap (OSM), you can update it using the built-in iD Editor. This helps improve navigation, fleet management, and road safety applications that rely on OSM data.
Before you begin:
Have an OpenStreetMap account.
Verify the speed limit from official road signs or reliable local knowledge.
Step 1: Sign in to OpenStreetMap
Sign in to your account.
Search for the road you want to edit.
Step 2: Open the iD Editor
Zoom in until the road is clearly visible.
Click Edit at the top of the page.
The iD Editor will load.
Screenshot: iD Editor displaying the selected area.
Step 3: Select the Road
Click directly on the road segment.
The road will be highlighted.
The properties panel appears on the right.
Step 4: Locate the Speed Limit Field
In the right panel, scroll to Road Details.
Find the Speed Limit (Maximum Speed) field.
If no speed limit exists, you can add one.
Step 5: Update the Speed Limit
Enter the posted speed limit.
Examples:
| Posted Sign | Enter |
|---|---|
| 50 km/h | 50 |
| 80 km/h | 80 |
| 100 km/h | 100 |
| 35 mph | 35 |
Note: Only include the unit for non-metric countries (e.g., mph). Metric countries generally use numeric values only.
Step 6: Split the Road (If the Speed Limit Changes)
If the speed limit changes partway along the road:
Select the road.
Right-click (or use the Scissors/Split tool).
Split the road where the speed limit changes.
Apply the correct speed limit to each section.
Example:
| Road Section | Speed Limit |
|---|---|
| Town Centre | 50 |
| Highway Section | 80 |
Step 7: Save Your Changes
Click Save.
Enter a descriptive changeset comment.
Example:
Updated posted speed limit from 60 km/h to 80 km/h based on road signage.
Review the changes.
Click Upload.
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