A man had stopped his blue Kia Cerato in an emergency lane on the westbound side of the Logan Motorway near Forest Lake.

Shortly before noon, a white Kia Cerato collided with his vehicle, and according to police reports, the man may have also been struck during the incident.

Authorities suspect the man was outside his vehicle at the time and has sustained critical injuries.

The driver of the white Kia, a woman in her 30s, is currently cooperating with police investigations.

Officials are appealing for any witnesses or motorists with dashcam footage to come forward.

The investigation is still underway.

Motorists are warned to expect major delays on the westbound lanes of the motorway, with traffic crawling past the crash scene.