From Interstate 35 Frontage Road and University Boulevard, Round Rock, Texas, drive west on Farm to Market 1431 W toward IH 35. Make the first left turn onto IH 35. Take the ramp to your left onto I-35 S. Take exit 252A-252B toward Farm to mrkt Road 620/Mc Neil Road. Merge onto IH 35. Make a right turn onto Ranch to Market 620 W/Round Rock AveContinue to follow Ranch to Market 620 W.