If you're driving I-35 you need to be south of downtown Austin and heading home no later than 2 pm. I've been using the "two o'clock" rule all my years in Austin. It sounds a bit too early for rush hour, but I promise you, the highway will be deadlocked. It's like 281 north of 1604. "Sure, its 1 p.m., but where the hell did all these cars come from!" Now if you're interested in an alternate route, well, there is the dreaded toll road

Actually I LOVE toll roads and it only takes a person one time driving them to feel the same. SH 45 starts just north of Buda. It completely bypasses Austin and will drop you off in RR. Safe travels
