New version 1.3.7-12 with:
- implement track length and duration measurements.
- correct the autosave functionality for tracks.
- add a setting for autosave period.
- add a bottom drawer to display track information.

For the traffic info from Google, That would be great, but I didn't found if they give access to their data. In essence, what I've understand is that, if you use their own JS implementation of maps, you can ask for an overlay, but I don't know how to get the overlay without using their map rendering implementation. Any suggestion is welcomed !