The drivers had to swiftly slow down to avoid four cows on a road section in Dong Nai's Long Thanh District.
A driver said the cows walked into the middle of the road at first and only after realizing there were vehicles nearby did they move to the emergency lane.
"I found it really dangerous," he said.
A representative from the Vietnam Expressway Services Engineering JSC said that after the cows were seen on surveillance cameras, staff were sent to the areas to keep them away.
The HCMC – Long Thanh – Dau Giay Expressway runs 55 km between HCMC and Dong Nai. This is not the first time cattle have been seen strolling on the road.