Actually, depending on the ratio of guests using a mobility device that needs the wheelchair/
ECV space and those that are ambulatory, this would not be fair at all. Of course, this does depend on the scenario. For example, closing at MK -
how many people fit on one bus? Let's say 70, using standing room. There are 200 people in the queue, including 3 needing the W/ECV spaces. 67% of the W/ECV get on. (2/3) Let's say they don't have anyone else with them. There's room for 68 more people. There are 197 people standing in the queue. 68/197 = 35%.
Now, if there is a scooter at the stop first, the bus shows up and there's no space for the scooter, then I agree that the bus should just roll on by and call for another bus to come. But there's no way for the bus driver to tell who got there first, unless there's an accessible queue being used.