YSK: if you think taking an ambulance to an Emergency Room because you think it'll get you seen sooner. DON'T!
Why YSK: If you're injured or ill but it's not life or limb threatening and you decide to call an ambulance thinking it'll be faster and you'll be seen first... WRONG. Ambulance crews very frequently will advise the hospital staff that you "can wait". Then we'll plop you into a wheel chair and push you into the waiting room with everyone else.
Yeah, that's what they did with me when I went in a couple of weeks ago here in Australia (non-critical car accident). The paramedics hung around and I stayed on their ambulance stretcher until I went into an Emergency bed.