If you’re on the train/bus, the disabled seats are there for a reason; don’t use them if you don’t need them.
Elevators get full of people who can walk up stairs and then people who can’t have to wait and wait and wait. If you’re using elevators, pay attention to whether this is happening.
Accessible toilet stalls often get occupied by people who don’t need them and take forever using them. If you can use the regular stalls and regular stalls are available, don’t use the accessible stalls.
People block ramps all the time by hanging out on or in front of them. If you’re hanging around a ramp, pay attention to whether you’re in the way of someone who needs to use it.