History
Like I-985, I-575 was mostly constructed as a suburban spur highway, intended to serve an undeveloped area for future settlement, rather than as one to relieve traffic, or to link I-75 to an existing city or large town. It has since accelerated land development and population growth in the area far beyond what GDOT predicted, essentially causing its own traffic. (After just 20 years, it carried as many cars per day as it was expected to in 40 years.)
The first stage of I-575 was constructed in 1979 from I-75 to SR 92 near Woodstock and was opened to traffic on October 16, 1980. The next section to Georgia 20 began construction in 1981, and was opened on March 29, 1985 as far north as exit 11 (now mile 20). The section between the original exit 8 (now 16A) and exit 10 (now 19) was originally part of the Canton Bypass (SR 20), which was constructed in 1978. The final portion of I-575 to past Howell Bridge Road and SR 372 opened later, and that extended the highway to its present length of 31 miles (50 km), although the northernmost one mile (1.6 km) given in this length was not constructed up to Interstate Highway standards, since it extends past a surface ("at-grade") intersection. This final portion north of Canton was constructed of concrete rather than asphalt, and narrow black lines run on either side of the white lane markings.
In 2000, Georgia switched over from a sequential exit numbering system to a mileage-based exit numbering system.
In 2008, GDOT added a cable barrier.
The road was last repaved in summer 2009, with funds from the American Recovery and Reinvestment Act.
Read more about this topic: Interstate 575
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