A 24-hour garda crackdown on speeding gets under way this morning.

"Operation Slow Down" began at 7am and will continue until 7am tomorrow.

Gardaí say the operation is designed to raise awareness of the dangers of excessive speed and reduce the number of speed related road crashes, which will save lives and reduce injuries.

Gardaí say a 1% reduction in speed leads to a 4% decrease in fatal crashes.

Statistics shows Friday and Saturday are the most dangerous days on the roads, and July and August the peak months for fatal collisions.