King road drag
（重定向自Road drag）
![David Ward King, Inventor of the King Road Drag](/Images/godic/202502/07/David_Ward_King-1_En5720.jpg")
![Contemporary Drawing of the King Road Drag](/Images/godic/202502/07/King_Road_Drag5720.jpg")
![Road Before King Road Drag](/Images/godic/202502/07/King_Road_Drag_Before5720.jpg")
![King Road Drag in Operation](/Images/godic/202502/07/King_Road_Drag_11-16-055721.jpg")
The King road drag (also known as the Missouri road drag and the split log road drag) was a road grader implement for grading dirt roads that revolutionized the maintenance of the dirt roads in the early 1900s. It was invented by David Ward King, who went by "D. Ward King" and who was a farmer whose farm was in Holt Township, near Maitland, Missouri.