Idaho Interstate 15
![Idaho Interstate 15 sign.](img/ID/ID19830151i1.jpg)
1961 specification guide sign shield. Manufactured in 1968.
This shield with no state name is Silver Scotchlite on steel and dates to 1968. It uses the 1961 specification for green-sign shields.
Photo by Jake Bear, 10/28/2007.
![Idaho Interstate 15 sign.](img/ID/ID19830151i2.jpg)