Any time you want to merge with other traffic, you should:

Question

Anytime you want to merge with other traffic, you need a gap of about four seconds. If you move into the middle of a four-second gap, both you and the vehicle behind you have a two-second following distance. You need a four-second gap whenever you change lanes, enter a roadway, or when your lane merges with another travel lane.

Accepted Answer

Allow a gap of about four seconds.

Answer

Wait until your travel lane is ending and then merge, even into a small gap.

Answer

Merge at any time, regardless of a gap.

Answer

Merge into a traffic lane only when other drivers have stopped their vehicles.