Get distances and duration summaries by mode

Summaries of total distances and durations spent travelling per mode and per scenario, for the baseline population

Usage

dist_dur_tbls(trip_scen_sets)

trip_scen_sets: list of synthetic trip sets for each scenario including the baseline

list of table of (total) distances and durations per mode per scenario

The function performs the following steps:

loop through the scenarios (incl Baseline):
- using the trip data, sum across the distances by stage mode to get total distance by mode for each scenario for the baseline population
- sum across the duration by stage mode to get total duration by mode for each scenario
- if 'walk_to_pt' stages exist, add them to the pedestrian stages for both duration and distance
create one dataframe containing the total distances by mode for each scenario
create one dataframe containing the total duration by mode for each scenario
remove any 'walk_to_pt' stages as they have been added to the pedestrian stages
update the bus and car driver distances and duration in the scenarios using the ratio of bus/car to bus_driver/car_driver in the baseline scenario (this is redundant for the GLOBAL, BOGOTA, AFRICA_INDIA and LATAM scenario definitions as bus and car driver distances are already updated during the scenario creation)