With this patch enabled, the catchment area around a 'station' varies depending on what type of station it is. For example, train stations have a larger catchment area than bus stations and airports' catchment areas are bigger still. It even varies with the type of airport; Intercontinental Airports have the biggest.
The catchment areas are as follows.
CA_BUS Station = 3, CA_TRUCK Station = 3, CA_AIR_OILPAD (Helipad on oil rig) = 3, CA_TRAIN Station = 4, CA_AIR_HELIPORT = 4, CA_AIR_SMALL Airport = 4, CA_AIR_LARGE (airport) = 5, CA_DOCK = 5, CA_AIR_METRO (metropolitan) = 6, CA_AIR_INTERNATIONL = 8,