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Campus Loop North and Campus Loop South -- both actually the same loop, just with one going clockwise and the other counterclockwise. So the "North" and "South" designations are just kinda confusing, since (y'know, being a loop) both routes end up heading north and south at some point.
North Express -- It does indeed serve North Campus, but given that it stops at literally every stop--whether there are passengers waiting or not--it seems a bit dishonest to refer to it as "Express".
East Residential -- This one's fairly accurately named, but it's a bit amusing that the one marked "ER" goes nowhere near the University Hospital.
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Alternative names:
* Campus Loop Counter and Campus Loop Clock
* Campus Loop Positive and Campus Loop Negative
* Campus Loop RH and Campus Loop LH
* Campus Loop Outer and Campus Loop Inner
That last one is actually used on I-495 around Washington DC -- the Beltway is referred to as having an Outer Loop and an Inner Loop.
"Inner" and "Outer" seems to be how most of us think of it anyway...if you're on "the wrong side of the street", you'll have to do the full loop before getting to your destination, etc.