The Path

I would have enough money to pay for college if I got a nickel every time I had an awkward meeting with someone on The Path here at Roberts.

Think about it:
You're walking briskly in one direction and your friend passes you going the other way.

You: Hey! How's it going?
Friend: Good, how're you?
You: (Unable to respond because you'll a) be late to class or b) clog up The Path if you stop to answer.)

Let's consider another option with the same scenario:
You: Hey! What's up?
Friend: Oh, heading to class.
You: (Unable to respond. Friend doesn't ask anything because he or she is smart enough to know where you're headed if you're walking down The Path with a backpack on during the week.)

This leaves four non-verbal options:
1- Classic high five.
2 - Light punch in the arm.
3 - Awkward wave.
4 - Smile and keep walking.

Under normal circumstances, the classic high five would be an excellent option. However, due to the rate of speed at which students are walking, it could prove dangerous. And if the receiver of the high five isn't expecting it, then it's just plain embarrassing.
A light punch in the arm is great, but it's definitely situational. It can only be used 1) if the receiver of the punch is male, 2) if the receiver of the punch is a close friend, and 3) if your pace is slow enough that you don't miss and hit his face...or the air.
The awkward wave is usually just that: awkward. With the typical parade of students, it's easy for people to get confused and think you're waving to them if you're not. Also, if it's early morning, do not be offended if the person you intended the wave for doesn't notice. His or her eyes are probably opened just barely enough to see the ground in front of them.
And, finally, the smile and keep walking. This really is the only viable option for Path walking. If you are able to make eye contact with a friend, it's great, and anyone else who sees you just thinks you're friendly.

There you have it, friends. All of those awkward Path moments...solved.