RoundaboutThailand
Traffic rules
Thailand
1. Roundabout
A roundabout is a circular road arrangement in which traffic travels around a central island in one designated direction. Vehicles enter and leave through connecting roads, and traffic signs or local rules determine who has priority.
Drivers should reduce speed, choose a suitable lane, observe all road users and signal as required when leaving. The direction of travel, entry priority, lane use and rules for cyclists and pedestrians depend on local traffic signs and regulations.
Who has priority at a roundabout in Thailand?
At a Thai roundabout, the Road Traffic Act requires yielding to traffic on the right when no traffic sign specifies otherwise. Follow the roundabout direction and any additional priority or signal control.
🔗 aipalync.org • Act 73; actual controls first, otherwise traffic on right in roundabout
Mandatory roundabout direction.
English • Traffic sign บ.48 • Roundabout. Circulate clockwise, passing around the island to the left. Give way to vehicles already circulating and do not cut in front of or force your way between them.
ไทย • บ.48 • วงเวียน. ขับรถวนตามเข็มนาฬิกาโดยอ้อมวงเวียนไปทางซ้าย ให้รถที่อยู่ในวงเวียนผ่านไปก่อน และอย่าตัดหน้าหรือแทรกรถในวงเวียน
Sources
🔗 Commons.wikimedia.org (So Monggo • CC BY-SA 4.0)
🔗 Doh.go.th • กรมทางหลวง • คู่มือ พ.ศ. 2561 • เล่ม 1 • หน้า PDF 79
SVG source: Commons.wikimedia.org • Original SVG
Government of Thailand • Public domain • Original revision 2017-12-06. Wikimedia original unmodified.
Artwork reviewed against the Thai Department of Highways 2018 catalogue: Doh.go.th • PDF page 79. Catalogue-equivalent illustration; intentional update from the previous PNG.
Warning for a roundabout.
English • Traffic sign ต.21 • Roundabout ahead. Reduce speed and prepare to pass around the roundabout to the left.
ไทย • ต.21 • วงเวียนข้างหน้า. ข้างหน้ามีวงเวียน ให้ลดความเร็วและเตรียมขับรถอ้อมวงเวียนไปทางซ้าย
Sources
🔗 Commons.wikimedia.org
🔗 Doh.go.th • กรมทางหลวง • คู่มือ พ.ศ. 2561 • เล่ม 1 • หน้า PDF 94
SVG source: Government of Thailand • Public domain • Original revision 2018-01-11. Wikimedia original unmodified.
How should you choose a roundabout lane in Thailand?
Choose your intended exit before entering and follow the lane arrows and destination signs. Keep to the marked route and make any permitted lane change only when safe; having priority over entering traffic does not give you priority to change lanes.
🔗 aipalync.org • Act 73; actual controls first, otherwise traffic on right in roundabout
What should you check when leaving a roundabout in Thailand?
Check the lane you will cross or enter, signal the manoeuvre as required and look for cyclists and pedestrians at the exit. Obey any separate crossing controls and do not force an exit across another vehicle’s path.
🔗 aipalync.org • Act 73; actual controls first, otherwise traffic on right in roundabout
