wilyflier:
your instructor was absolutely right!
the same applied possibly to your chemistry teacher who used to tell you: remember to pour acid into the water!
these are the golden rules which should be generally obeyed - especially by people who do not have the deep knowledge and experience.
As you would probably agree there are always exceptions to general rules, and these exceptions are being sometimes used to the user advantage.
And i am not talking here about speed limit being sometimes overstreched by all of us being experienced drivers
even if we all know that dangerous speed kills.