One-time browser geolocation on page load · accuracy varies (GPS on mobile, IP-based on desktop)
Top-left panel showing % of roads matched to each speed-limit data source (state survey by type, OSM tag, estimate), with a per-state toggle
Applies to camera markers and No cameras route finding.
Developer
Layout
Force mobile layout
On by default for development. Turn off to use the route sidebar on screens at least 760px wide and 560px tall, including tablets.
Map
OpenFreeMap Dark vector style via MapLibre · off falls back to CARTO raster
Basemap
Vector Dark is the default · OSM Standard is a dev raster for comparing OSM tags (heavy use discouraged per OSM tile policy)
Hard-stop panning at the ingested states + min zoom · off leaves the map free
Dashed land-border perimeter of the loaded states
Speed Overlay
Hide Filtered and Custom, put No Estimations first, and use it by default. On by default.
🛣 Speed Limits overlay only — fetch new ground mid-drag instead of waiting for mouse release · off by default, multiplies backend requests while panning
🛣 Serve simplified cells at z12 · off always serves full detail
🛣 Warm neighboring cells idle so pans paint from cache · off fetches on release only
Debug
Keep the 🐞 debug marker overlay and button available while a route is planned · off by default so debug markers don't clutter an active route
🐞 debug layer only — remove the per-request camera cap so a bbox always shows every camera in it · for verifying whether missing cameras are a cap truncation or a bbox bug · may get laggy in very dense views
Shows candidate scores after each bendy route calculation · developer tool
Speed Editor
Click a road on the map to edit its speed segments.
Drag the ⇔ handles along the road — or click it to move the nearest handle — then set the speed and Save.
Vantage Maps