Traffic patterns repeat themselves. I've tried getting driving directions with Google Maps, but it seems like they only provide the estimate with either no traffic being on the way, or with only the current traffic situation being accounted for.
What if I need to arrive at time X to place Y from place Z? What time do I depart, taking the prior traffic patterns in consideration (which I'm unfamiliar with, since it's my first time being in the area)?
In other words, where do I get the information about the average traffic congestion between two given points at a given time window on a given day of the week? (I'm currently in need of such information for travelling from Riverside to LA, but it would also be useful for directions between San Jose and San Francisco etc.)