A teenage boy is in critical condition, and eight others are injured after a serious collision on the M50. Gardaí and emergency services were alerted to a vehicle travelling northbound on the southbound carriageway of the M50, at 5:30 am on Sunday. AdvertisementThe driver of the second car, a man in his 20s, was injured and taken to hospital. The section of the M50 from Junction 12 to Junction 11 southbound remains closed with local diversions in place. Gardaí are appealing to road users who were travelling on the M50 between Junction 14 and Junction 11 northbound or southbound between 5.00am and 5.30am on Sunday.