(February 2000) Current Iowa Interste sign. Iowa still uses the basic original interstate design with the state name and small number fonts. Note also that Iowa shows which interchange number you're entering I-80 at.
(February 2000) US shield on BGS (big green sign). Note that Iowa places a black border around the shield.
Embossed US highway sign with what appears to be original paint. Note the narrow IOWA font. This sign is probably from the late 20's or early 30's (Collection of Robert Edgar)
(December 2000) Current style Iowa state route marker. Signs in the 20's showed the number inside the state shape, but Iowa has used a circle sign ever since then.
(February 2000) Current three-digit Iowa state route marker. Iowa only uses 24" x 24" signs. For three-digit numbers, the fonts are condensed.
This is a photo from the 1941 Iowa Official Highway map. Iowa used this design from the 1920's until roughly the 1960's. There may also be a design used between this design and the current design that is simply a cut circle with no "IOWA". The sign below the route marker says "TRACTORS WITH LUGS PROHIBITED" (Map from my collection)
A very nice photo of an older embossed Iowa state route marker. Very early signs in the style were cast iron, but this one appears to be emobssed steel. This sign was featured on Ebay (Owner unknown).
(February 2000) Davenport, IA. Standard Iowa county marker. Iowa follows the standard county numbering system and uses the pentagonal shield.
(February 2000) Davenport, IA. County shield on BGS. Newer signs no longer have the white box around the pentagon shield.