Ok, I'll concede that I didn't know the finer details of what that triangle thingy is. And I have seen farm equipment before, folks - not all of northern NJ is what you see from the Turnpike...
All right, so in many places the farmer's not required to have lights, signals, or even be anything short of oblivious to anything outside his cockpit. I have a fundamental problem with that, and think it needs to change. The "rules of the road" say you need to be aware of your surroundings, have working lights, and signal your intentions. You wanna use the road? Play by the Rules. Darky's point about dual-sport bikes is an excellent one, IMHO - you can't force them to have/use safety equipment if you're not going to do it to everyone.
Is it really such a major inconvenience to have to put lights on your tractor and actually USE them to signal when you're going to turn broadside across the street? Would it really be hurting anyone? It's not going to kill anyone (rather, I'd wager it'd more likely prevent someone from getting killed).
Frankly, I'm surprised more people aren't killed by accidents like the one that started the thread.