Temporary traffic-control sign
Right lane shifts; left continues
Thai road sign ตก.12 — Right lane shifts; left continues. Meaning: The left lane continues while the right lane shifts 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.12
Road response
On the road
Driver action
What should you do?
The left lane continues while the right lane shifts through the work zone. Reduce speed before the signed condition and keep enough space to respond safely.
Exam-style scenario
Read the situation
The right lane moves sideways around works while the adjacent left lane continues straight.
Best response: Follow the temporary markings for your right lane as it moves sideways, without drifting into the straight left lane.
Sign comparison
Don’t confuse it
This sign
Right lane shifts; left continues
Compare with
Two lanes shift right
Key difference
Only the right lane moves sideways while the left remains straight; the two-lane shift sign bends both lanes to the right.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
