Density at a longitudinal asphalt joint is consistently low because the cold side has a vertical unsupported edge and little confinement. Which field adjustment is most likely to help?

1. Lower the paver speed only and make no other changes
2. Improve joint construction and rolling so the hot side is properly overlapped and confined
3. Reduce the number of rollers so the mat cools faster
4. Skip density checks at the joint because they are always lower