We've always taken ourselves (our DD's) into the ED. We have only called an ambulance once for DD2 when she's had a febrile convulsion but the paramedics cleared her for us to take her to our GP. DD1 has been to the ED 4 times and we've always driven her. She's been for severe gastro twice, a broken leg and severe hives. If any of us were having breathing problems, in extreme pain, had horrendous bleeding or were unconscious then I wouldn't hesitate to call an ambo but yes, it's definitely fine to 'walk in' to the ED.