Rollers have to be operated according to accepted practice and never parked on the mat. With the paver moving at a slower speed, the rollers can easily keep up and compaction is improved. A lift of paving is a second opportunity. Another lift of paving would be a third opportunity. So we count the number of opportunities, thinking we can improve the mat a certain percentage with each opportunity.
Many contractors support the ADOT model.
He said government agencies must recognize that quality costs time and money and that incentives are appropriate. Contractors would respond to rewards for increases in smoothness above minimum quality level. Three years ago, the highway industry asked its customer, the motoring public, what it wanted. The public's response was loud and clear. The pavement smoothness specification pioneered by ADOT has the potential to be a tremendous tool to meet that need.