What would traffice be like on these roads New Years Eve day near Milpitas?
I don't think anyone can know beforehand. Traffic on both is always busy. Listen to traffic before deciding which route you will take.
daytime on a Saturday, the usual clog up near Powell St in Emeryville. I don't know too much about 680, but I think there is a backup towards your way by the truck scales. If it's raining, give an hour more time. If you are driving in the evening, give it an hour plus more time. Don't drink and drive and buckle up. Check the CHP traffic webpage before you take off. Happy 2006.