Since that time , it has been extended through Grayling along first US Highway 27 ( US 27 ) .
Now Business Loop I - 75 ( BL 75 ) to connect with the state park .
Since that time , it has been extended through Grayling along first US Highway 27 ( US 27 ) and now Business Loop I - 75 ( BL 75 ) to connect with the state park .