Would mapbox be interested? I would love to continue working on this and perhaps open source (ideal). Current what I am showing is only Utah, and tops 30 min, but given more time, it could render on the gpu rather than svg's and also I tested with 3 hour isochrones and it's still pretty instant (less than a second locally)
edit - also I used an OSRM like algorithm in that the accuracy is down to the second on the road
A little unorthodox perhaps, but a while ago for my own project I built isochrones that solves/sends results O(log(n))
https://isochrones.regia.io/
Would mapbox be interested? I would love to continue working on this and perhaps open source (ideal). Current what I am showing is only Utah, and tops 30 min, but given more time, it could render on the gpu rather than svg's and also I tested with 3 hour isochrones and it's still pretty instant (less than a second locally)
edit - also I used an OSRM like algorithm in that the accuracy is down to the second on the road