warning sign
Zipper merge ahead
Thai road sign ต.74 — Zipper merge ahead. Meaning: Traffic streams merge alternately ahead. Learner-manual coverage: this identity is shown in the current DLT car-driver learner manual. Inclusion does not mean it appears in every theory test.
Thai name: ป้ายเตือนการรวมช่องจราจรแบบสลับฟันปลา
Independent English reference · Source: Department of Highways · Sign ต.74
Road response
On the road
Driver action
What should you do?
Traffic streams merge alternately ahead. Adjust speed and merge in turn with vehicles from the adjacent lane.
Exam-style scenario
Read the situation
Two queues approach a reduction where vehicles should combine alternately rather than merge early into one line.
Best response: Continue to the merge point at a controlled speed and alternate with one vehicle from the adjacent queue.
Sign comparison
Don’t confuse it
This sign
Zipper merge ahead
Compare with
Right lane merges left
Key difference
Zipper merge calls for alternating vehicles from two streams at the merge point; the work-zone lane-merge sign only shows which lane ends and where it joins.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
