Ive always viewed it as a "not fully ready to respond"... same as when we roll up on scene and the gurney is not made or all the equipment is out of the jump bag and needs to be put in before we leave the rig
I'm curious other EMTs takes on "Backing in" the ambulance to parking spots while waiting for a call. I always see 911 services backed in while IFT companies always just pull in facing a wall or an obstacle requiring them to reverse before leaving. In my opinion it looks unproffesional to park...