Class S Mix Improves South Dakota Winter Traffic

“Based on how Class S has performed so far, we’re likely to use it on more high traffic areas off the interstate,” Costello adds. “We’ve done a good job in designing our dense graded asphalt mix used on the majority of our road projects. Since 1998 we’ve had a QC/QA program for most of our asphalt mixes. We’ve overcome some issues we had prior to that. We’re always striving to balance the effect of 100-degree to minus-20 degree temperature swings. That’s just part of our South Dakota climate.”