The bathrooms for the disabled tend to be bigger to fit a wheel chair, have lower sinks and lower air driers/paper dispensers, and also have metal railings to make getting on and off the toilet seat easier. They are often kept separate from regular bathrooms to reduce traffic and so they are available when they are needed. If there is a bathroom for the disabled, chances are there are regular bathrooms not to far away.
OHhhhhhh! Neutron burn!