Emergency crews and tow trucks clear up to 15 cars involved in pileups on South Eastern Freeway Multiple car crash and heavy fog on the South Eastern Freeway near Mount Osmond. The pileups occurred between the Heysen Tunnels and Mt Osmond interchange just after 8am. One of the pileups involved about a dozen cars crashing nose to tail, while a second crash involved three cars. MORE: Taken a good snap? Send in your pictures, videos and news tips via Newsforce Traffic was reduced to one lane on the Freeway downtrack and the speed limit was reduced as the crashed cars combined with heavy fog and drizzle to create hazardous conditions. Emergency crews and tow trucks spent about two hours clearing the mess while traffic banked up past the Crafers interchange. TELL US: Were you there? Describe the scene in the comments box below The last of the cars were removed just after 10am and residual delays are now clearing. Fog and rain was also an issue south of Adelaide, where an earlier car rollover on Main South Rd at O'Halloran Hill caused lengthy delays for commuters. MORE: Man dies in South Rd crash The car rolled just south of the intersection with Lander Rd just after 6.30am. No one was seriously injured. The car has since been cleared. Fog patches and drizzle have prompted a road weather alert to be issued for Adelaide this morning. Sir Donald Bradman Dr, Adelaide Airport Main North Rd, Blair Athol Henley Beach Rd, Brooklyn Park Goodwood Rd, Colonel Light Gardens Cavan Rd, Dry Creek Main North Road, Enfield Anzac Hwy, Glenelg Lonsdale Rd, Hallett Cove Lyons Rd, Holden Hill Grand Junction Rd, Hope Valley Churchill Rd, Kilburn Henley Beach Rd, Lockleys Smart Rd, Modbury Main South Rd, O'Halloran Hill Gorge Rd, Paracombe Regency Rd, Prospect Richmond Rd, Richmond Brighton Rd, Seacliff Marion Rd, South Plympton Hancock Rd and North East Rd, St Agnes Holbrooks Rd, Underdale Ascot Ave, Vale Park · Anzac Highway/Keen Av, Glenelg East · Bridge Rd/Montague Rd, Pooraka · Bridge Rd/Wright Rd, Pooraka · Fullarton Rd/King William St, Norwood · Grange Rd/Frobisher Av, Flinders Park · Main North Rd/Philip Hwy, Elizabeth · Main South Rd/Majors Rd, O'Halloran Hill · Ocean Boulevard/Gardenia St, Seacliff Park · Panalatinga Rd/Pimpala Rd, Woodcroft · Richmond Rd/Bartholomew St, Richmond · Seaview Rd/Marlborough St, Henley Beach · South Rd/Everard Av, Keswick · Tapleys Hill Rd/Elaine Av, Seaton · Tapleys Hill Rd/Russell St, Glenelg North