Travel time option to use in measures

[cbueth]

Add time option to use in measures.
Right now edge length is used.

When travel_time is selected

• Assign speed limit to edges
  • Can be done using osmnx speed inferrence (unit08_openstreetmap),
    mixed with
  • but max 30 km/h on LTNs
  • default as 50 km/h on sparsified graph
• Calculate travel_time as length/speed_limit (in hours) -> seconds

[cbueth]

Use osmnx speeds for unrestricted calculation and for the restricted one parametrize with two speeds. On sparse graph $v_s$, inside LTNs $v_{LTN}$.

Write original max speed attribute speed_kph with osmnx.speed.add_edge_speeds() and travel time in seconds with add_edge_travel_times to attr travel_time.
Write to attr travel_time_restricted the travel times using $v_s$ and $v_{LTN}$ from the config.ini.