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OpenDRIVE editor — free, browser-based, no install

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drawtonomy is, first and foremost, a free browser-based whiteboard for driving scenarios. But because lanes, junctions, and regulatory elements are first-class shapes on the canvas, the same tool also works as a free, browser-based OpenDRIVE editor: open an ASAM OpenDRIVE .xodr file, edit lanes and junctions visually in 2D, and export back to OpenDRIVE 1.8 — all in the browser. No install, no account. Roads you don’t touch are re-emitted from the original file verbatim through a carry-through sidecar, so the rest of the network is preserved.

Importing an OpenDRIVE .xodr file, then editing and re-exporting it.

What drawtonomy actually does with OpenDRIVE

Section titled “What drawtonomy actually does with OpenDRIVE”

Per its exporter documentation:

  • Reads a .xodr file, evaluates the analytical geometry (lines, arcs, spirals, polynomials), and renders roads as drawtonomy Lane shapes.
  • Lets you pick only the roads you need, then reshape boundaries (drag points, smooth boundaries, basic geometry edits) and edit lane connections.
  • Re-exports the result to OpenDRIVE (up to 1.8). Roads you didn’t touch are re-emitted from the original file verbatim through a carry-through sidecar, so their analytical geometry is preserved exactly.

What drawtonomy doesn’t do

Section titled “What drawtonomy doesn’t do”
  • 3D detail — elevation, banking, bridges, grade separation. The canvas is 2D, so vertical geometry is dropped on import and not authored on export.
  • Authoring native analytical geometry — you don’t edit clothoids or polynomials directly; roads you draw from scratch are fitted from sampled points (fine for esmini / CARLA / Autoware, not for road-design CAD). RoadRunner and Truevision Designer are the right tools for clothoid-level control. Roads you imported and didn’t reshape keep their original analytical geometry via carry-through.
  • City-scale or survey-grade maps against LiDAR / aerial imagery.

Where drawtonomy fits best

Section titled “Where drawtonomy fits best”
  • Opening a .xodr someone handed you quickly, in the browser, with no desktop install or licence.
  • Geometric edits — fixing a boundary, smoothing a segment, adjusting a lane connection or junction.
  • Regulatory edits — placing or moving traffic lights, traffic signs (including speed limits), stop lines, and right-of-way relations, linked to the lanes they govern.
  • Cropping a region from a larger map for a paper figure or teaching example.
  • A quick playable check in esmini after an edit.

If your edit needs clothoid-level geometric control, 3D detail, or city-scale survey-grade authoring, use RoadRunner or Truevision Designer. drawtonomy is the browser-side 2D editor for everything in between.

Concrete workflow: a small geometry fix

Section titled “Concrete workflow: a small geometry fix”
  1. Import → pick the .xodr file.
  2. In the selection preview, choose only the roads you need.
  3. Pan / zoom to the lane you want to touch.
  4. Click to select; drag boundary control points; use the Smooth Boundary button.
  5. Export → OpenDRIVE.
  6. Open the result in odrviewer.io or load it in esmini to confirm only what you intended changed.

The carry-through sidecar means roads outside your edit are re-emitted as-is, so the rest of the network is untouched.

See Import an OpenDRIVE (.xodr) file for the import details.

How it compares to other OpenDRIVE editors

Section titled “How it compares to other OpenDRIVE editors”
  • MathWorks RoadRunner — the de-facto HD-map editor, full OpenDRIVE 1.4–1.8, 3D, commercial. Use it for survey-grade authoring against aerial imagery and LiDAR.
  • Truevision Designer — a desktop OpenDRIVE editor, free for non-commercial use. Strong clothoid-level geometric control.
  • LaneMaker — a free 3D road network editor that targets OpenDRIVE export. Worth a look if you want a free 3D authoring path.
  • odrviewer.io — a viewer (not an editor) for .xodr files. Useful to verify exports.
  • Blender Driving Scenario Creator — open-source, with proper clothoid geometry and junctions.

drawtonomy is the browser-based, lightweight, free option for 2D edits and small-map cropping. If you need clothoid-level control, 3D, or city-scale survey authoring, use RoadRunner or Truevision Designer.

Side-by-side comparisons: drawtonomy vs RoadRunner, vs Truevision Designer, vs odrviewer.io.

Section titled “Related reading”