This week's Throwback Thursday takes us to Hartford, Connecticut, where in November 2008, I found a blue CT 2 shield. Per this article at Kurumi.com (http://www.kurumi.com/roads/ct/colors.html), Connecticut had tried to color code some route shields at one time, but I don't think that CT 2 was part of that program.
The Federal Highway Aid Act of 1956 brought the Interstate Highway System into existence which would largely be constructed by Federal Highway Administration fund matching. The Interstate Highway System was deliberately numbered to run opposite the established conventions of the US Route System. While the Interstate Highway numbering conventions are now well established there was a period during the late 1950s where they were still being finalized. This blog examines the history of the establishing of the chargeable Interstate Highway route numbers in California. The above blog cover depicts the Interstate Highway route numbers requested by the Division of Highways in the Los Angeles area during November 1957. The establishment of the numbering conventions of California's chargeable Interstates The Interstate Highway System was not created in a vacuum by way of the passage of the 1956 Federal Highway Aid Act. The beginning of the Interstate Highway System can be found in the