CHANGE: The congestion level is now taken to be the percentage increase of journey times above the non-congested base, as used by the TomTom congestion index.
CHANGE: Comparative journey times (taking into account congestion) is now the basis of choice between private car, public transport and walking, except that those who always prefer to use their car will always do so where they can.
CHANGE: As a result of the above, the base_car_preference_percent setting in simuconf.tab is abolished.