Location: SH 78 and FM 6, Collin Cty Reassurance shield after FM 6 as we finally leave Lavon. Just ahead, we’ll briefly enter and leave a practical exclave of Wylie, believe it or not. Location: SH 78 and SH 78 Business, Collin Cty A couple miles later, we’ll approach a junction with SH 78 business … Continue reading Texas State Highway 78, TX-FM6 to TX-78 Bus