mandatory sign
Pass either side
Thai road sign บ.42 — Pass either side. Meaning: Drivers may pass either to the left or to the right of the sign or obstruction where both paths rejoin the same route. 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: ป้ายให้ชิดซ้ายหรือชิดขวา
Independent English reference · Source: Department of Highways · Sign บ.42
Road response
On the road
Driver action
What should you do?
Drivers may pass either to the left or to the right of the sign or obstruction where both paths rejoin the same route.
Exam-style scenario
Read the situation
A central island has usable lanes on both sides and this sign is fixed at its approach.
Best response: Choose either clear lane around the island and rejoin the route without crossing into the other path.
Sign comparison
Don’t confuse it
This sign
Pass either side
Compare with
Keep left
Key difference
Two downward arrows permit either side of the obstruction; Keep left has one arrow and allows only the left-hand path.
Put sign knowledge into practice.
Answer exam-style questions about road signs, traffic lights, and lane markings in clear English.
