As a volunteer firefighter, I drove any of a number of different fire trucks to emergency calls, there is an adrenaline rush in the response, and you can let your guard down at the wrong time. I could drive at highway speed for fifteen minutes, so lots of opportunity for something to go wrong. We had very few bumps with the trucks during all those years, and none serious, but there were so many times it could have been really bad - particularly at train level crossings. Sad, very sad, and I have empathy for the firefighters, sometimes you just forget something....
For those times I have been flying TCAS equipped airplanes (uncommon for me) I've always been a little surprised and amused at proximity warnings about airplanes taxiing on a parallel taxiway when I was on the runway. I now see value for TCAS in all airport vehicles which could plausibly access a runway - the driver would at least get a warning!