The roads were only reopened at 7.50pm yesterday.
The M13 is closed and motorists are advised to travel through Cowies Hill.
The man was accosted by three armed men who demanded cash and keys to the vehicle.
KZN spokesman, Lt/Col Thulani Zwane said the culprits mostly travel in a Hyundai H100 pickup truck or a bakkie.
Despite objections from residents, these premises in question are still being licensed.
Police are investigating the motive of the stabbing.
Pinetown SAPS has warned residents to be aware of their surroundings and report suspicious activities.
It is believed the man was killed during a house robbery.
The victim was left with his vehicle in Isipingo Hills.
The detectives were doing their routine duties in the area when they received information from an informant about a business robbery that was going to take place at one of the restaurants in New Germany.
The baby was found in a refuse bag.