For traps my routine is this...(i have to work traps on arm days because my chest, back and shoulder days are already way too heavy).
It looks like this...Traps before arms...
Shrugs: Alternate EOW barbell w/dumbell. .Heavy as you can handle. (this means of course w/good form...if your formgets sloppy then lower the weight and always go for the burn)...anyway...
BB shrugs
135 X 15-20 or untill fail
(set 2 repeat)
225 till fail, continue w/rest/pause till fried.
*Now we get tricky. I now begin to do what I call "high-deads".
5 or 6 sets of 5 from the power or squat rack.
315 X 5
405 X 5
495 X 5
585 X 5
675 X 5 (14-45lb. plates on bar). At this point, if I still feel good...i'll do 1 more set of...
765lbs. X 5 (16 plates)...this will hurt!

Then we go back to shrugs...
225 X whatever I can still manage.
135 X 1 or 2 burn sets. That's it!...DONE!
Hope this gives you a means to the madness! J.