Do You Think A Disabled Card Should Be Issued ? Like A Placard..?

To those who can’t stand in lines a long time , especially at Theme Parks, grocery etc. Who are often in pain.. that in using a wheelchair could aggravate their condition. Their being mobile is limited. And, no means to sit while advancing in line. What is your suggestions? to solve this concern for many disabled persons. It is a legitimate concern for many. Who otherwise would be homebound.
and,
would you let someone go ahead of you , if saw they seemed in pain..?