Road tolls are relatively rare in Ireland (about 12) and Northern Ireland (none). Ferries normally do charge a fee. There are domestic and island air routes, but OSM doesn’t map air routes. Parking is sometimes paid, sometimes free, depending on demand, time and location.
State or municipally-owned tourist amenities are often free, but you may need to pay for visitor centres (in a small number of cases the visitor centre may be mandatory if you want to see the main attraction) and/or parking and/or extra services.
This search: overpass turbo looks for:
- toll=yes or
- barrier=toll_booth or
- highway=toll_gantry
The main current uses appear to be:
- Tolled highway=*
- Ferries to mainland Europe, Britain and the Isle of Man.
- Cross-harbour / bay ferries and ferries to islands.
- Access to airport and other parking(!).
- Access to tourist and other amenities(!!), some of which include highway=*, e.g. a fee at the car park of a forest park, collected at the gate upon entry.
Would I be right in thinking that these tags should only be associated with tolled highway=, and the rest should use fee= instead?