Emergency services are at the scene of a crash on the South Link Road.
The incident happened during early morning rush-hour and was expected to lead to significant delays around the city.
It took place at traffic lights on the South Link Rd, at the junction of Boreenmanna Rd.
Fire crews, gardaí and the ambulance service attended the scene and diversions have been put in place.
The condition of the occupants of the vehicles is not yet known.
There have also been reports of a collision on the N20 on the Cork side of Mallow.
:: More details to follow.