Asymmetric Traffic

Has anyone else noticed that there is more traffic going to work in the morning than in the afternoon coming home from work?

I conclude that there are several people who work fewer hours than me. The other conclusion--that there are several people who work more hours than me--seems to be very unlikely. (I'm on the road going to work from 7 a.m. to 7:30 a.m., and coming home from 4 p.m. to 4:30 p.m.)