SA man dies after being hit by truck

A pedestrian has died after being hit by a truck in Adelaide's northern suburbs.

The 57-year-old man died at the scene along the southbound track of Port Wakefield Road in Mawson Lakes about 2:30am on Friday.

The truck driver was not physically injured in the crash.

A portion of Port Wakefield Road was closed for several hours as police examined the scene.

Anyone with information is asked to contact Crime Stoppers on 1800 333 000.