In my case I finally told my midwives I wanted to just go to the hospital after 3.5 days with a broken water. They had thought birth was emminent on Friday. It was Sunday afternoon I went. They don't typically do checks, but on Saturday afternoon I was at a 9 with baby's head only as far up as my midwife's first knuckle. Over 24 hours later, still the same. My blood pressure was also up and I could tell the midwife was worried because she got it down (finally) with homeopathics, and then told me, "I can't tell you how relieved I am". Then it went back up a couple of hours later.
When I told them I wanted to go they also told me a number of things that could happen at the hospital that I wouldn't like, like they were trying to talk me out of going. I finally said I just want to go. Then the one midwife said they had called the hospital 20 minutes before I told them I wanted to go to tell them I was coming, because they knew I had to go. It was really cool, because I felt like it was totally my decision, and then I find out without a doubt that they thought it was the right descison too.
I never thought I'd transport. I didn't even have a bag packed "just in case" so had to pack then. I still had an awesome, unmedicated birth though (well, just 20 minutes on pitocin, which isn't really medicine). My midwife was right by my side, holding my leg. She impressed the hell out of the hospital staff a few times, I could tell. And before the evening L & D nurse left for the night she came into my room and told me she was grateful for being able to be there and that it was a beautiful birth.
(okay, so I'm totally OT, but hey, I started the thread, I can derail it, right?