Puts all vehicle information in one place including speeds and emission factors. Writes to global environment.
Details
This function performs the following operations:
Based on the city specific (or default) mode speeds, the vehicle inventory is initialised
PM emissions are added from the city specific (or default) PM inventory
heavy_truck mode is added for which there is no distance but it this mode is used in the air pollution modules
other mode is added if it does not already exist in the travel survey (and hence in the mode speeds)
CO2 emissions are added from the city specific (or default) CO2 inventory
if car_driver exists, the car_driver emissions are set to the PM and CO2 car emissions
VEHICLE_INVENTORY is set as a global variable