Gardaí have arrested four motorists for dangerous driving in the Dublin Port Tunnel today.

The state-of-the-art Garda recording system had the capability to record more than 300 phone lines all day, every day, over a six-year period.

The National Ambulance Service (NAS) has pledged to restore publilc confidence in the system after a review found a 999 call taker did not follow protocol which resulted in an ambulance not being sent to help a dying toddler.