Seattle has more than a few 3-minute loading parking zones around neighborhoods. They're usually placed to be convenient for wheelchairs, walkers, dollys, hand trucks, and carts; but aren't restricted to any group. And unlike most other street parking, most of these spots don't swap to free at 8pm, instead staying loading zones 24/7.

Enforcement is the same as any other priority parking spot - if the police find your unattended car, they'll ticket and tow.

And most people seem pretty honest about it. It's easier to park somewhere else if you're eating or working in your car. And less risky (cheaper) to park in a garage if you'll be a while.