State Route 316 in Georgia
State Route 316 is a state route in the U.S. state of Georgia. The road connects the metropolis of Atlanta with the city of Athens to the east. The route is 63 kilometers long, the first part of which is a freeway, the rest is a multi-lane main road.
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The highway branches off Interstate 85, 25 miles from downtown Atlanta. The highway has 2×2 lanes here, and leads through the far eastern suburbs. After just four exits, the highway section ends at Lawrenceville. After that, the road is called the University Parkway. After Lawrenceville, you also leave the metropolitan area of Atlanta and enter the densely forested countryside of eastern Georgia. The road is double numbered with US 29. Major intersections are grade separated. The road ends in Athens, a city of 100,000 inhabitants, on the city’s ring road.
The freeway portion of 316 in Lawrenceville was opened to traffic in 1971. There were once plans for a full-fledged highway to Athens, but they never materialized. However, on October 28, 2014, two new connections opened in northern Lawrenceville, extending the highway 3 kilometers to State Route 20.
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The busiest point has 78,000 vehicles, as the road is the main road between Atlanta and Athens. Outside the agglomeration this drops to 30,000 vehicles per 24 hours.
State Route 400 in Georgia
State Route 400 is a State Route and toll road in the U.S. state of Georgia. The highway connects Atlanta with the northern suburbs. The road is located between Interstate 85 and Interstate 285, but officially continues to Dahlonega, double-numbered with US 19. The route is 87 kilometers long.
SR-400 on the north side of Atlanta.
The highway branches off Interstate 85 in northern Atlanta and runs north as a 2×3 lane freeway. After a few kilometers there is an office park near the SR-400, where there are overpasses by offices above the highway. There is a light rail in the central reservation. The highway then leads through Buckhead’s office park, with overpasses. After that, the highway ends at Atlanta’s ring road, Interstate 285. US 19 continues straight as a parkway.
State Route 400 was originally a toll road between I-285 and I-85 in Atlanta. The toll collection was discontinued on November 22, 2013. The toll road portion was one of the last new highways in the Atlanta area. The highway opened to traffic on August 1, 1993, relieving I-285 and I-75 or I-85 of through traffic from the northern suburbs to downtown Atlanta. Originally, the highway was planned further south to Interstate 675 to create a north-south axis through eastern Atlanta, offloading the eastern portion of I-285 and the Downtown Connector. This was canceled due to the Freeway Revolts.
On April 2, 2014, new flyovers opened between I-85 and SR-400, allowing traffic to travel from south to northeast and vice versa.
Work began in November 2015 to widen SR-400 between McFarland Parkway and Bald Ridge Marina Road at Cumming to 2×3 lanes. This part is 14 kilometers long. On October 5, 2016 already opened 3 kilometers with 3 lanes. On September 18, 2017, the last 3-lane section opened to the north and on January 3, 2018, the final 3-lane section opened to the south.
Between 2016 and 2022, the interchange between I-285 and State Route 400/US 19 on the north side of Atlanta will be upgraded. The project also includes 7 kilometers of I-285 around the interchange. There will be extra flyovers, traffic flows will be unwoven and left-wing inserters will be removed. I-285 will also have a parallel structure between Roswell Road and Ashford-Dunwoody Road. Work started on November 3, 2016 and should be completed by mid-2022. The project will cost approximately $800 million.
Another project is the construction of express lanes on SR-400 between I-285 and McFarland Parkway in Alpharetta. The plan includes 2×2 express lanes on overpasses between I-285 and Spalding Drive in Sandy Springs, and 2×2 express lanes at ground level between Spalding Drive and McGinnis Ferry Road in Alpharetta, the northernmost section will have 2×1 express lanes between McGinnis Ferry Road and the terminus at McFarland Parkway. The entire project is 27 kilometers long, 23 kilometers of which will have 2×2 express lanes. In 2018, there was talk of a realization of the express lanes from 2021, but the tender was canceled in August 2021, making the start of the project uncertain.
Every day, 120,000 vehicles use State Route 400 between I-85 and I-285.
The southern end of State Route 400 was the highway section with the highest rate of unpredictable travel time in the United States in 2011. The trajectory has a buffer index of 256 percent, which means that 19 out of 20 trips require more time than average. The Travel Time Index is 1.63, which means that the travel time is 63% longer than average. This gives this road section place 216 in the country.