More than 1,000 motorists were detected speeding during National Slow Down Day, including one travelling at more than double the speed limit in Dublin and another going twice the limit in Drogheda.

The operation ran from 7am yesterday until 7am today.

Of the 126,001 vehicles checked, 1,072 were driving over the applicable speed limit, including a motorist driving at 202km/h on a 100km/h stretch of Dublin's M50.

In Co Tipperary, a motorist was detected travelling at 201km/h in a 120km/h zone on the M8 in Cashel, while in Clonmel a vehicle was clocked at 99km/h in a 50km/h zone.

Gardaí in Co Louth detected a car being driven at 172km/h in a 100km/h zone on the R173 near Jenkinstown, while another motorist was detected travelling at 125km/h in a 60km/h zone on the R132 at Mell, Drogheda.

"We would like to thank the 124,929 drivers who were found to be compliant and drove within the speed limits," Chief Superintendent Paul Cleary of the Roads Policing Bureau said.

"While the vast majority motorists were found to be travelling safely and well within the speed limits, there are still those who continue to drive at excessive and inappropriate speeds.

"We will continue to focus our enforcement activities on non-compliant motorists as we strive to reduce the number of fatal and serious injury collisions across our roads network".

To date, 57 people have been killed on Irish roads, an increase of six on same period last year.

Pedestrians account for 30% of all fatalities this year.