When paving the hot lane against a previously placed cold HMA lane, how should the longitudinal joint generally be constructed and compacted?

1. Leave a 6-inch open gap so rainwater can drain through the joint
2. Overlap the cold edge slightly, match the joint, and compact from the hot side so the joint is pinched and densified
3. Always roll only from the cold lane so the new mix is not displaced
4. Omit tack at the joint face so the two lanes can move independently