Temporary traffic-control sign
Traffic shifts left, then right
Thai road sign ตก.13 — Traffic shifts left, then right. Meaning: The traffic path shifts left and then returns to the right through the work zone. 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: ป้ายเตือนเบี่ยงเบนการจราจร
Independent English reference · Source: Department of Highways · Sign ตก.13
Road response
On the road
Driver action
What should you do?
The traffic path shifts left and then returns to the right through the work zone. Reduce speed before the signed condition and keep enough space to respond safely.
Exam-style scenario
Read the situation
One temporary lane bends left around the closure and then returns right to the original alignment.
Best response: Track the temporary single lane left around the closure and then back right to the original alignment.
Sign comparison
Don’t confuse it
This sign
Traffic shifts left, then right
Compare with
Two lanes shift left, then right
Key difference
A single lane moves left and then returns right; the companion diagram shows two lanes following the same offset.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
