Motorcyclist dies on Ingle Farm street after crash in separate suburb north of Adelaide CBD

Police are investigating after witnesses reported a motorcycle rider who had just crashed north of Adelaide's CBD was loaded into a car before emergency service crews later found him on a street in a different suburb.

SA Police said emergency services were called to Whittington Street, Enfield, about 2:00am this morning after receiving reports that a motorcycle travelling east had crashed on the street.

Witnesses told police they saw a car stop and load the motorcycle rider into the car before driving away.

Later, around 2:40am, emergency services were called to Mark Court, Ingle Farm, about 6 kilometres away, after receiving reports that a motorcycle rider had been found unconscious on the street.

The 45-year-old man died at the scene despite efforts from paramedics.

Major Crash investigators are this morning examining the circumstances that led to the crash and the man's death.

Police are urging anyone with information that may assist the investigation to contact Crime Stoppers.

The number of people killed on South Australia's roads this year now stands at 22, compared to 18 at the same time last year.

Three men and a woman died in crashes over the Adelaide Cup weekend.