Down here in Phoenix, we have the great migration of Snow birds. Every year at about October to November, we get a influx of about 1 million people. The restaurants here are just waiting for these snow birds to pack their tables, and eat their food. They come from all over, Minnesota, Canada, North Dakota, and from just about everywhere there is snow. Not saying old people can't drive, but they pack the streets, and are usually not in a hurry to get anywhere. You find yourself avoiding stores that boarder the retirement communities to avoid the lines, and you are just waiting for National Geographic to do a story on The Great Migration.
But that doesn't account for all the traffic. We also have a huge influx for spring training. During this time, I try to avoid restaurant areas, as the waits get long. Also you can add 15 minutes to your morning commute, and plan to sit in traffic at all times. But then suddenly something happens, Opening day , and the first 100 degree day. Just like that the migrating birds pack their bags, and are on their way back north. Not to say I don't enjoy the process, but I am ready to see them go this year.