The Minnesota Department of Transportation (Mn/DOT) constructed experimental test sections of retrofit load transfer and DBR on U. S. Highway 52, a divided 4-lane highway near Zumbrota, Minnesota that was originally constructed in 1983. Multiple dowel bar configurations were evaluated.

This paper analyzes the use of larger groove width and depth, and smaller groove spacing, to reduce hydroplaning risk.

Next generation concrete surface (NGCS) and conventional diamond grinding (CDG) test sections were constructed on I-10 EB in the vicinity of Estrella Parkway interchange in Avondale, Arizona. The work occurred between April 30 and May 3, 2010.

Low Noise Diamond Grinding (LNDG) is essentially an adaption of a US innovation called Next Generation Concrete Surfacing (NGCS). In February 2012, there was an opportunity to trial LNDG on the New England Highway near Branxton. This trial was used to evaluate whether the treatment could be used for a 4 km section of the Hunter Expressway, at Greta, where an equivalent noise outcome to that provided by dense graded asphalt was required.

In 1969, what is now Caltrans evaluated six diamond grooving patterns on County Road 32A near Sacramento, California. The results of that study indicated that none of the patterns presented a safety issue to motorcyclists.

Fifteen states and three international transportation authorities have reaped the benefits of Next Generation Concrete Surface (NGCS), a smooth, safe, quiet concrete surface. They experienced lower winter accident rates, noticed improved maintenance efforts, achieved IRI numbers consistently as low as the 20s and earned compliments from the driving public.