A GPS transmitter to prevent accidents? Do you mean like a device that announces you're going to be somewhere so people will please not hit you?

Tell you what. I like that I can go to a bike shop, pick out a bike I like, and ride it. I got mine because I like the way it handles and fits me, and because it's comfortable. Also I like that it has wide tires for a road bike so I can take it on dirt and gravel roads. I like my GPS computer because it has maps right there on the device, they're useful even in places I can't get a signal. There are other GPS bike computers that don't have that, and those are great for people who don't ride in places they aren't familiar with. It's really nice to be able to get a bike that's right for you, and a computer that's right for you (or no computer if that's best), and pair them according to your needs.