CHANGE: Reduce the passenger factor from 9 to 8 to compensate for making all journeys return journeys.
CHANGE: Implement new system for calibrating congestion in simuconf.tab.
CHANGE: Implement new vehicle occupancy level mapping for traffic_level in simuconf.tab
CHANGE: Increase the renovation percentage to 52 from 45 to create denser cities
CHANGE: Increse the separation distance between cities
CODE: Add spreadsheets for calibrating congestion, etc.