Gardaí have defended zero tolerence measures on the enforcement of speed limits in the greater Dublin area.

Officers have been told to issue penalty points to drivers who exceed the speed limit by even 1 mph - despite the fact that the technology used to measure speeds has a margin of error.

But Fine Gael says that the issue of badly located and damaged speed limit signs needs to be addressed before any implementation of a zero tolerance policy by Gardaí.

The party's Transport spokesperson, Denis Naughten, says thousands of signs are badly located or blocked by poor visibility.

He is calling for an immediate review of the design and location of the speed limit indicators.