The arch is flanked with blind roundels above the impost line, with rustication below. It alsoemployed ornate elements like impost mouldings and pilastered capitals. This tax increase was a significant impost for owners. Above the columns are impost blocks decorated with colored geometrical designs. On September 11, Smith accepted an impost of for the Narragansett Special at Narragansett Park. The bottom-most part of the arch, called the springing, rests on the impost. Jews passing Arles during the 17th century were forced to pay a crown impost. He was assigned on the 1942 Experimental Free Handicap, the highest impost ever. Colonial Colony (2004) carried the lightest winning Foster impost at 111 pounds. Mucho Macho Man was assigned the highest impost at .