TxDOT breaks ground on Oak Hill Parkway project in southwest Austin More than half a billion dollars is being spent to expand a major corridor in southwest Austin. AUSTIN, Texas - The Y at Oak Hill where US 290 and SH 71 split off is a major gateway in and out of Austin. But it's also a place where traffic flow typically comes to a grinding halt. Recent modifications only provided limited relief for those who drive through the Y. "We were going out just yesterday, it took about a good 30 minutes going through," said commuter Paul Yanez. On Thursday morning with a groundbreaking ceremony, TxDOT officially launched a $674 million rebuild. "30 years of talk is over, and today we start doing, said Texas Transportation Commission chairman J. Bruce Bugg.