Authorities are trying to identify a young male driver who appeared in a video riding a motorbike with his feet while using a phone.
The short video, which has become viral recently, was apparently filmed from another vehicle alongside.
The man in his late teen to early 20s did not wear a crash helmet. It is unclear who was on the phone, but he could be heard saying "I'm coming home, mom. I'm driving very safe."
He also turned his head around after a truck approaching from behind and honking.
Local media have reported many cases of young men performing dangerous stunts on Vietnamese streets. Many of them were fined after being identified by traffic police.
Last week, Bac Ninh police fined a 21-year-old man VND7.3 million (US$326) in a similar case.
Do Van Hieu's violations include driving on one wheel, not wearing a helmet, no bike registration and no driving license.