I'm from San Diego as well, and although you don't always have the luxury of leaving 3 times as early as you think you will need to, it's a good idea to pad your commute time as much as possible. All it takes is one good accident along the way to skew your travel time. If you get there way early, go have breakfast!
I remember one time driving to LA area for a band competition, and I didn't get to leave the SD area until 5:00 pm, and I made it into the stadium, running from the parking lot, all in a panic, making my way through the deadlocked crowd at the stadium, JUST in time to see our school's band take the field. Luckily I saw them perform, but I missed every other band that night.
I know traffic is horrendous, but the weather is so fabulous, in my mind it makes up for everything else. I grew up in Michigan, and while it was beautiful there, and had no traffic, I am in San Diego to stay. Yes we have earthquakes (occasionally) and bad traffic, but in Michigan we had tornadoes, ice storms, blizzards, humidity, mosquitoes, heavy thunderstorms.... Not to knock it at all, it was a great place to grow up, but I love southern California!!
I am so looking forward to finals next week. Whenever a non-drum-corps person asks me an innocent question about drum corps, I always catch myself going on and on and on, so it will be so great to meet new drum corps friends and talk to other folks who know what I mean and get it!!