All GDOT route ID’s in Numetric are unique 11 character strings which summarize all relevant data within the route, including the county code, route type/ownership, route number, route suffix, and direction.
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The breakdown of the route ID is outlined below using the sample Route ID: 12310036NOI

The first three characters of every route ID make up the county code.

All GDOT counties are assigned a three-digit county code, starting with 001 and ending with 321, with only the odd numbers being used (E.g. 001, 003, 005, 007, etc.). 

Click here to download a list of all counties and their county code from the GDOT website.
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The fourth character of every route ID makes up the route type or ownership.

Each route ID will have one of the following one-digit route type/ownership codes:

The fifth through eighth characters of every route ID make up the route number.

All routes are assigned four-digit route number ranging from 0000 - 9999 (e.g. 0001, 0101, 1001, etc.).
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The ninth and tenth characters of every route ID make up the route suffix.

Each route ID will have one of the following two-character route suffix codes:

The eleventh (last) character of every route ID makes up the direction.

The direction is either listed as I (indicating Inventory) or D (indicating divided opposite inventory direction).