Join highway traffic

MERGE

Think of how two lanes become one smoothly on the road.

"Join highway traffic" hints at the action you take when entering a road where cars are already moving. The answer is "MERGE," which directly describes blending into the flow of vehicles. There’s no wordplay here—it’s a straightforward definition where the clue and answer match the real-world driving term. Think of the signs you see on on-ramps that say "Merge."