That's the result of a survey undertaken by Continental Tyres Ireland at the weekend, carried out with the help of laser speedgun technology supliers Tele-Traffic.
Continental suggests that the high number of speeding vehicles could be down to the fact that drivers might not have known they were driving in a 30km/h speed limit area because there are no signs anywhere to inform them.
The company says the lack of signage is something that needs to be addressed by the city council.
Its Irish general manager Paddy Murphy says a car driving inadvertantly above the speed limit can get into trouble when coming up suddenly behind a car that is observing the the limit.
"Very often, drivers seriously overestimate the stopping ability of their car," he notes. "For example, at 50km/h, an average car on good tyres in good weather conditions will take almost 24 metres, or six car lengths, to stop. And if the road is wet, or perhaps if tyres are worn or damaged, the stopping distance would be a whole lot longer."
The 30km/h speed limit zone comprises a large section of Dublin city centre including the quays between Ormond and Eden Quays north of the Liffey and Wellington and Burgh Quays on the southern side.
