He takes special care of his two wheelchair-bound passengers. Arriving at their place, he parks his ambulance at the handicaps' lot. He goes round to the back of the vehicle, opens the twin doors and put down the platform for the wheelchair. Then he goes and pushes his passengers, one at a time, onto the platform. He presses the jack button and raises the platform and the wheelchair to the level of vehicle floor and help him to his seat.
Foul weather is one thing.
Another is that his special passengers sometime spring surprises. But Mr Lee does not panick. Nor does he sound the siren with flashing lights. Really, it's only an urgent answer to Nature's call.