Let's build a real-time traffic dashboard from scratch. By the end, you'll have a map showing live incidents, camera popups with images, and road condition overlays — all powered by Road511's GeoJSON API.
Setup
Create an index.html with Leaflet:
<!DOCTYPE html> <html> <head> <link rel= "stylesheet" href= "https://unpkg.com/[email protected]/dist/leaflet.css" > <style> body { margin : 0 ; } #map { height : 100vh ; } </style> </head> <body> <div id= "map" ></div> <script src= "https://unpkg.com/[email protected]/dist/leaflet.js" ></script> <script src= "app.js" ></script> </body> </html>
Enter fullscreen mode
Exit fullscreen mode
Initialize the Map
// app.js const API_KEY = ' your_api_key ' ; const BASE = ' https://api.road511.com/api/v1 ' ;
const map = L . map ( ' map ' ). setView ([ 39.8 , - 98.5 ], 5 ); // center of US L . tileLayer ( ' https://tile.openstreetmap.org/{z}/{x}/{y}.png ' , { attribution : ' © OpenStreetMap ' }).…
