For example, when I had depression, I often worried that I will get a ticket. I once parked near a fire hydrant at night without any warning signs or a red curb, and got a ticket which caused significant distress. I filed a dispute, which, after a half-year "evaluation" period, was rejected. Dealing with parking tickets is anxiety-provoking and energy-depleting.
I also worried about hitting other cars and people as I was looking for a parking space. I'd feel much safer to know where I'm going to park.
The anxiety made it significantly harder for me to function, just as if I had a broken leg. This anxiety is excessive and much more intense then what most people feel.
Anxiety is a disability; and a frighteningly real one. Therefore, we need to give disabled placards to people who have depression and anxiety.