Ummm... take the train, man :-)
Mercedes and BMW I beleive have developed progressive Brake lights - the harder the pedal is pressed, the brighter and more lights light. You should always be watching at least one car in front of the one you are following - then you have more idea what is happening.
If someone is on and off the brakes, I will pass them as soon as possible - they usually are bad drivers. They aren't braking, just thinking about it. They should be watching 2 or three cars ahead and flowing with the traffic.
I travel a lot for work, and most drivers are VERY scary, and don't concentrate on driving. Often (because I watch ahead) I am overtaking before the car in front even realises there is a straight. The same people will tailgate for miles and never pass, they are so close they can't see past what they need to overtake (gas, brake, gas, brake) - so they may as well pull back and enjoy the drive and leave room for me to pull in where I need to :-) I'm not a perfect driver, I just plan ahead, and be courteous to those who are driving well and being courteous themselves. But if you're doing 80 in a 100 and are stopping people getting past, expect me to follow you with my high beams on, in third gear just waiting for you to brake so I can pull out and pass as you slow down (just to piss you off because every other time I pulled out, you sped up!)
Thats my rant for today!
Allan :-)