Title 32, Chapter 4, Section 70
(a) As used in this Code section, the term "bridge" shall include
the approaches to such bridge within 50 feet of either end except
when the bridge itself measures 100 feet or more, in which case the
term "bridge" shall include the approaches within 100 feet of either
end of the bridge.
(b) Where the contract relates to the construction or reconstruction of all or a part of a bridge, the county or counties affected may require the successful contractor to add to the conditions of the performance bond required under paragraph (1) of Code Section 32-4-69 the following condition: to keep the bridge in good condition for a period of not less than seven years.