Two workers riding a motorbike were killed on the spot after they collided with an ambulance on Saturday evening in Binh Duong Province.
The accident happened at around 7 pm when the two victims, Thach Hung, 35 and Lam Hoang Nam, 26, were driving near the Huynh Van Luy and Tran Quoc Toan crossroads in the province's Thu Dau Mot Town.
The two workers collided with the ambulance at high speed from the other direction, VNA reported, without saying which vehicle was on the wrong lane.
The ambulance was transferring a pregnant woman from Binh Phuoc Hospital to Ho Chi Minh City's Tu Du Hospital to give birth.
After the residents surrounded the ambulance, the driver, 39-year-old Nguyen Viet Minh, fled the scene and turned himself in to local police soon later.
Another ambulance was mobilized from the Binh Duong Hospital to take the patient to HCMC.
Police are investigating the accident.
On the same day, a container truck crashed into a bus in Gia Lai Province's Chu Pong District, killing two people and seriously injuring two others.
The accident happened at around 10 a.m. on National Road 19 in heavy rain and the two vehicles were travelling in the opposite direction.
The deceased victims are Nguyen Van Dung, 35, and Tran Thi Luc, 50, both workers of the 72 Rubber Company. Two others on the bus, Nguyen Tong Kieu, 25 and Nguyen Duy Phuong, 19, suffered multiple injuries and are being treated at the local hospital.
Vietnam has a high number of traffic accidents. In the first nine months of this year, there were 23,619 traffic accidents that killed 6,908 people and injured 25,002. The number of cases has decreased by 28.4 percent over the same period last year.
The Ministry of Transportation has reported an ongoing "rapid increase" in vehicle registration. By the end of September, Vietnam had registered more than 35.6 million motorbikes and 1.97 million automobiles.