How to Visualize Multiple Overlapping Routes on a MapLibre GL Map

When building route planners, logistics dashboards, or public transport maps, you often need to display multiple routes that share the same roads. Without proper handling, these routes stack on top of each other and only the last-drawn route is visible. Users cannot compare routes or even confirm that all paths are displayed. In a previous tutorial , we explored three approaches to solve this problem in Leaflet. MapLibre GL offers a simpler solution: the built-in line-offset paint property. No plugins, no geometry manipulation - just a single property that visually shifts each route by a specified number of pixels. This tutorial shows how to use line-offset to display multiple overlapping routes clearly on a MapLibre GL map. Try the live demo: View on CodePen APIs used: Routing API - calculate routes between waypoints Map Tiles API - vector map style Map Marker Icon API - custom markers What you will learn: When overlapping routes are a problem and how to solve it How to use MapLibre G