A section of Charoen Krung Road near the Electricity Authority in Bangkok suddenly subsided on Wednesday morning and the road has been partially closed to traffic.
The road surface collapsed around 10am on Wednesday.
A video posted online shows a large hole in the road surface, raising concerns about safety and disruption of traffic flow in the busy area. The collapsed section is several metres long.
Rescue teams and other agencies rushed to the scene to evaluate the damage, begin traffic control measures and prevent further accidents.
The cause of the collapse was still being investigated.
Motorists are advised to avoid the area if possible and use alternative routes until repairs are completed and the road fully reopened.
The incident follows the recent major sinkhole on Samsen Road outside Vajira Hospital.
