The Ballamodha straight will be closed for several hours following a crash.
Fire crews from Castletown and Malew station have attended the incident involving two cars.
One casualty was cut out of the car, with crews also helping the ambulance service.
It’s not yet known when the route will reopen - it’s currently closed from Solomon’s Corner to the St Marks junction.
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police
"No dispute" over Liverpool Ferry Terminal, says main contractor
More weekend bus strikes to come after 10-day walkout?
Minister to face question about bus strike