departure_mon can work on a mode-exclusion basis. By default, it returns all means/modes of transport. You can then specify modes to exclude using the exclMOT_<MOTId>=1 parameter.
The MOTIds are:
- 1 = Trains
- 4 = tram
- 5 = bus
- 7 = coach
- 9 = ferry
- (and I think 11 = school bus but I’d double check)
For example, if you wanted to exclude everything except bus, you’d do:
&exclMOT_1=1&exclMOT_4=1&exclMOT_7=1&exclMOT_9=1&exclMOT_11=1
Hope that makes sense 