Open index.html in a supported browser.

In order to make edits and build bundle.js locally:

install npm: https://nodejs.org/en/
npm install -g browserify
npm install -g uglify-js

In route-spotter/

1. mkdir node_modules/
2. npm install git+https://github.com/transitland/finderjs.git
3. npm install leaflet-polylinedecorator
4. browserify js/index.js | uglifyjs > js/bundle.js

In addition, Route Spotter uses:
Leaflet.MovingMarker
leaflet.measure

Source for PolylineDecorator:
Leaflet.PolylineDecorator

Transitland's finderjs is forked from:
https://github.com/mynameistechno/finderjs