Originally Posted by
Carbonfiberboy
Don't try to take anything sharper than a gentle sweeper on them. Come off them if you can't see the road ahead. Never ride them behind another rider. Don't ride them in traffic. I don't recommend riding them at over 30, though I have done straight line descents at 40 or so on them. If you're going to use them, you have to practice on them for at least 1/2 hour of continuous riding a couple times a week. I've been riding aero bars for 15 years and these are my rules. I've never fallen, had, or caused an accident while using them.
I notice everybody has different rules when it comes to aerobars. I paceline with TT bikes all the time. Rule of thumb is 'care' when riding i.e. knowing the limitations which establish how you ride. This shouldn't preclude pacelining with other TT bikes.