Less people on the road?

During the holiday weekend it looked like there were a lot less people roaming around cycling to burn off those 4,000 calorie meals that I would have expected.  Maybe they were out of town or maybe it's just that the average temperature has dipped below 72 but either way there are fewer people around.  I wish there were more, I always feel safer when there masses or cyclists cruising around 101 in San Diego so drivers get used to seeing them.