To improve on the last comment, I really encourage you to look at the following website:
http://www.511.org/. It gives you the traffic conditions on a map in real time. So you can see exactly what the traffic situation is like any time of day, from your home. So I would suggest you visit this site at the same time of day (and preferrably same day of the week) to see what the conditions may be like when you come down.