General storyline

Hi @isikl,
I'd suggest to drop the part about hgv vs. car. Maybe more like:
- route Munich-Budapest with hgv
- I like your `extra_info` idea: request them with a normal hgv route and display the results similar to what you already did (don't forget some legend, hard to read)
- then request a route with `avoid_features=tollways` in an `options` dict and compare the route to the original request
- finally (if a lot of tolls in Austria), avoid Austria and compare as well with the 2 previous requests

Can you calculate the distance driven on tollway roads? Not sure what's in the `extra_info` response. Otherwise you could estimate toll costs maybe?! Also not sure how the toll system in Austria works..