Height limitThailand
Traffic rules
Thailand
1. Height limit
A height limit prohibits vehicles whose total height exceeds the value shown from entering or passing a road section, bridge, tunnel, gateway or other structure. The vehicle’s height includes its load and any equipment attached above it.
Drivers of high vehicles must know their exact height, observe advance warnings and use an alternative route when necessary. They should never rely only on visual judgement or attempt to pass beneath a structure when safe clearance is uncertain.
How should you read a low-bridge height restriction in Thailand?
The highway-sign Regulation distinguishes a regulatory height limit from an advance low-clearance warning. Sign บ.35 prohibits vehicles whose height, including the load, exceeds the displayed measurement in metres. Measure the complete vehicle, including roof equipment, and do not enter where it exceeds the restriction or cannot physically clear the structure.
Vehicles higher than indicated prohibited.
English • Traffic sign บ.35 • Height limit: 4.2 m. Vehicles exceeding 4.2 m overall height including their load must not enter.
ไทย • บ.35 • จำกัดความสูง 4.2 เมตร. ห้ามรถที่มีความสูงรวมสิ่งของที่บรรทุกเกิน 4.2 เมตรเข้าไปในทางที่ติดตั้งป้าย
Does a roof load count when checking vehicle height in Thailand?
Yes for practical clearance: measure the vehicle at its highest point with its load and fitted accessories, such as a roof box, bicycle or roof rack. Check the local legal measurement rules as well; an empty vehicle’s registered height is not enough when equipment has been added.
What should you do if your vehicle is too high for a bridge or tunnel in Thailand?
Do not try to squeeze under the structure. Use the signed alternative route and, if you are already close to the obstruction, stop where safe and seek traffic-control assistance rather than reversing unpredictably into moving traffic.
