Halifax Regional Police say a collision on Highway 111 in Dartmouth sent a number of people to hospital.
Police received reports shortly after 6 a.m. on Monday of a vehicle travelling northbound on the wrong side of the highway near Exit 5, followed by reports of a head-on collision near the Woodland Avenue on-ramp.
Officials say the occupants of both vehicles sustained serious injuries.
Southbound traffic between Woodland Avenue and Micmac Boulevard on Highway 111 was reduced to one lane but has since reopened after officers cleared the area.