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In Atlanta we have light traffic on Friday mornings but heavy traffic on Friday evening. My theory is that morning traffic is almost entirely people going to work, of whom there are slightly fewer on Fridays, but evening traffic is both people coming home from work and people going out for fun. The extra fun trips on Friday evening more than make up for the people not working on Friday.

Anecdotally, I think that traffic from San Francisco to Mountain View on Friday mornings is lighter. I attributed it to people working from home on Fridays while going into the office the other 4 days of the week.

My experience in the bay area has been that people overwhelmingly leave the area on the weekends. Any freeway that leads away from SF tends to be at a standstill by 3PM every Friday.

That pattern happens in the DC area, especially in the summer.