GM Milford Proving Ground Circle Track Reconstruction


Project Highlights:

  • Expedited schedule completed one month early
  • Four lanes of concrete spanning 4.5 miles
  • Unique parabolic shape, with up to 30% banking in upper lanes
  • 2016 Michigan Concrete Association Quality Award
  • 2017 American Concrete Paving Association Excellence in Concrete Pavement Award

What We Did


Reconstructing one of General Motor’s test tracks required high-tolerance construction and a quick turnaround time only Ajax Paving could deliver.

The GM Circle Test Track is one of GM’s most important assets for testing new vehicles, and every day it’s closed costs the automaker significant time and money. Working on an expedited schedule of less than eight months, Ajax Paving still managed to complete the project one month ahead of schedule.

Ajax Paving removed and replaced four concrete driving lanes with 8-inch pavement over 4.5 miles. Lane 5 was patched as needed. The inner asphalt shoulder was replaced and all the existing joints in the upper shoulder were resealed. Additionally, subgrade improvements were made throughout, an edge drain was installed outside the inner shoulder and various signage, electrical, and striping were upgraded.

Due to the track’s unique parabolic shape, up to 30% sloping/banking in the upper lanes, the concrete surface required the latest technology and pavement techniques. Ajax worked with GOMACO, the paver manufacture, to modify the pavers to ensure the automated grade control set the vertical location and horizontal grade for the best possible ride measurement.

The GM Circle Test Track won two major awards, the 2016 Michigan Concrete Association Quality Award and the 2017 American Concrete Paving Association Excellence in Concrete Pavement Award.

Project Photos:
High-Performance Paving

When millions of dollars are riding on the line, racing bodies and automotive manufacturers alike turn to Ajax Paving. Thanks to our highly experienced crews and the most advanced equipment in the industry, we can meet specifications for consistency to fractions of an inch across miles of track. Ajax Paving is one of two road construction companies in the nation to make the cut by NASCAR®. Their high-power race cars can go over 200 mph, so track surface quality and precision are essential for victory and driver safety. Fans can catch our work on race days at Michigan International Speedway, Phoenix International Raceway, and Watkins Glen International. Additionally, Ajax is always on the shortlist for precision paving projects for automakers. Ford Motor Company, General Motors Corporation, Fiat Chrysler Automotive, and Toyota Motor Corporation have all trusted Ajax to help them build proving grounds to test their next generation of cars, trucks, and SUVs.
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