It's not uncommon for me to go for a short walk during my prep period, or even just to walk across campus or to the office; in any event, I get outdoors en route from Point A to Point B, and often I'll see several students roaming the halls. Yes, they have their pass; they also have their phones out (usually), or are just standing around talking to someone else, or not seeming headed in any particular direction.
The Sacramento area has set some new record-low-temperatures-for-the-date recently, with temperatures in the thirties or forties throughout the day. Today on my trek to the office I didn't see a single student out of class. Funny, that :-)