Adhesion:

After rolling, leukocytes finally come to rest at point where they adhere firmly. This firm sticking of leukocytes to endothelium is called adhesion.———> 

—————> Leukocytes after adhesion on endothelial cell, stream runs above them just like setting of pebbles on base and flowing of river upward. This appearance of leukocytes and blood flow is called pavementing.