More than three quarters of Brisbane drivers have been sworn at or had rude gestures directed at them on city roads in the last 12 months, a study shows.
A survey carried out by Newspoll has found bad behaviour on the roads is regular and tension is high.
The Suncorp Insurance-commissioned poll also showed two thirds of the 1205 participants believe there is less courtesy on the roads compared with five years ago.
Brisbane's results largely mirrored state-wide trends.
The most common gripes experienced in the last year by drivers in Brisbane included: not indicating when turning or changing lanes (92 per cent); drivers going slowly in the right-hand lane (91 per cent); and tailgating (88 per cent).
Eighty-two per cent of Brisbane residents said they had been annoyed by loud music coming from other cars, while 77 per cent had been the victims of swearing or angry gestures.
More than half the people surveyed had witnessed motorists using bus, carpool and emergency lanes to beat the traffic.
“Unfortunately it's clear that driver courtesy is flying out the car window and as a result drivers are becoming stressed, angry and dangerous behind the wheel,” Suncorp spokeswoman Melissa Cronin said.
John Fraser, the principal consultant at John Fraser Fleet and Driver Consultancy, said more cars on older, inadequate roads in inner Brisbane could be to blame for the rise in discourteous driving.
“As you put more people into a given area, and part of that area is outdated, the more difficulties and frustrations you're going to create,” he said.
“I don't think the human nature thing has changed very much in terms of people getting angry...We don't like getting our path obstructed and getting held up, and people do take shortcuts and do things like driving up one-way streets the wrong way.”
Mr Fraser also said the number of private citizens taking on defensive driver courses had decreased due to a sharp rise in prices.