A 21-year-old motocross rider was seriously injured when another motorcycle landed on him on the Central Coast this afternoon.

CareFlight’s rapid response rescue helicopter was tasked to Mardi shortly before 3pm, landing at the property of the accident scene.

The man suffered head, chest and suspected spinal injuries when, after he crashed over a jump, a motorcycle following behind went over the jump and landed on top of him.

CareFlight’s specialist doctor and critical care paramedic treated the man at the scene for a severe head injury, intubating and placing him in an induced coma to stabilise him.

He was airlifted to Royal North Shore Hospital in a critical condition.