9-1-1 is busy

Friday Jen and I were heading to Blockbuster to get some movies. I was in the second lane from the right on a four lane expressway. There was an Explorer a couple car lengths in front of me one lane over and I noticed it starting to drift into the far left lane and BAM it nails the car waiting for a left turn signal and veers sideways into my lane. I slammed on the breaks and maneuvered away from the car and the debris left from the accident. For a second I thought the driver was going to just drive away but he/she eventually turned into a parking lot. I'm not sure why they just didn't pull over to the shoulder but whatever. By this time I'm past the accident and there are a lot of cars behind me so I didn't stop. I called 911 and got a recording asking if it was an emergency to which I replied yes. Then I got another recording saying that all lines were busy and to wait until the next available operator. I waited for a bit and by this time I figured someone else had gotten through or something so I hung up. I couldn't believe that 911 was busy. I wonder how often that happens and if anyone has died because of it.