Drivers blowing loud air horns in Ho Chi Minh City will face stiffer fines from June 30 under a new government decree.
From VND300,000-VND500,000 (USD15-USD25) now, it is set to go up to VND2 million-VND3 million (USD97.08-USD145.63), the Department of Traffic and Transportation has said.
Air horns are a menace on Vietnamese roads.
In June last year, when a truck driver blew his horn, a young woman who was carrying her two-year-old daughter on a motorbike was startled and fell on the road. Her daughter was run over by the truck.