Plate I. 
OPRRE I24C9 
Fig. 
1.— Failure of Brick Road near Zanesville, Ohio, Due to Defective 
Gravel Foundation and 11 -Ton Motor-Truck Traffic. 
OPRRE 13006 
Fig. 2. 
■Failure of Brick Road near Mansfield, Ohio, Due to Defective Con- 
struction and Heavy Motor-Truck Traffic. 
