Brighton & Hove is now showing the number of free seats and wheelchair seats if you click on any bus on a map.
For example:-
https://bustimes.org/services/2-rottingdean-woodingdean-brighton-hove-shoreham-s#map
For example:-
https://bustimes.org/services/2-rottingdean-woodingdean-brighton-hove-shoreham-s#map