Missouri Secondary State Route D is a north-south highway in Eastern Callaway County. It runs from Interstate 70/U.S. Rt. 40/Missouri Secondary State Route YY, near Williamsburg, south to Missouri State Route 94, near Portland. MO Sec St Rt D passes through the following towns in Callaway County. Williamsburg Readsville MO Sec St Rt D is not multi-plexed in Callaway County. MO Sec St Rt D crosses the following highways in Callaway County. Interstate 70, near Williamsburg. U.S. Rt. 40, near Williamsburg. Missouri Secondary State Route YY, near Williamsburg. Interstate 70, near Williamsburg. (NO Interchange) U.S. Rt. 40, near Williamsburg. (NO Interchange) Missouri Secondary State Route AB, near Williamsburg. Missouri Secondary State Route K, near Readsville. Missouri Secondary State Route O, near Readsville. Missouri State Route 94, near Portland.
