SurPRO 3500, at the September 2010 FHWA-sponsored testing on several pavements at the MnRoad facility in Minnesota and in Wisconsin, proved it was in a class of its own. It had much higher accuracy cross correlation than any other commercially available profiler on all six pavements. It even outperformed the Benchmark Device.
Types of Pavement Tested at the September 2010 FHWA Rodeo:
- Dense Graded AC
- 12.5mm SMA
- Chip Seal
- Transverse Tining
- Diamond Grinding
- Longitudinal Tining
Recap of the September 2010 FHWA Rodeo Test Results:
- Mean repeatability cross correlation for all six sections (IRI, long & medium filter) was 99.6%
- Individual cross correlations of 99.9% and 100.0%
- Accuracy cross correlation to Benchmark Device was very good, the best of any commercial profiler. Considering all sources of error influencing data collected by both profilers, SurPRO 3500 accuracy may exceed that of the Benchmark Device in some cases.
- IRI standard deviation <0.5% on all six sections
- 0.08% on dense graded AC, 0.1% on longitudinal tining
- SurPRO was insensitive to operator bias such as acceleration and transverse tilting motion
- Up to 99.9% repeatability using different operators
So how does SurPRO 3500 achieve these great results on such a wide range of textures, some of which drive laser profilers to distraction? Without giving away SurPRO secrets we can say it's a combination of tire durometer rating and profile, profiler geometry and inertial stabilizer.