A 33-year-old male motorcyclist has died after a traffic crash in Townsville involving the city's Mayor Jenny Hill.

Key points: Police say bystanders tried to help the motorcyclist but he couldn't be saved

Police say bystanders tried to help the motorcyclist but he couldn't be saved Officers believe Cr Hill was turning right when the collision occurred

Officers believe Cr Hill was turning right when the collision occurred Cr Hill is being treated for shock

The motorbike and a car collided at an intersection on Nathan Street in the suburb of Aitkenvale around 7:45am on Thursday.

Townsville City Council confirmed Cr Hill was involved in the crash.

District Duty Officer, Senior Sergeant Ian Wilkie, said only one person was in the car.

Paramedics said the motorcycle rider was taken to hospital in a critical condition, but later died.

No-one else was injured or assessed by paramedics.

Senior Sergeant Ian Wilkie said bystanders came to help the motorcyclist but he could not be saved.

Cr Hill's car after the fatal collision. ( ABC News )

"Two doctors on their way to work have stopped to assist as well as members of the public and we do sincerely thank them for their efforts to attempt to save this rider prior to the arrival of paramedics," he said.

Senior Sergeant Wilkie said the Forensic Crash Unit was investigating what caused the crash and would be collecting any CCTV footage it could.

"At this stage, it's quite obvious that the motorcycle has collided with the passenger side of the vehicle, the exact circumstances of that are part of the investigation," he said.

"It's terrible. This is an unnecessary incident. We just implore people to pay attention to what they're doing.

"Just driving a vehicle is a dangerous occupation."

The road has been closed to traffic and drivers have been urged to avoid the area. ( ABC News: Chloe Chomicki )

Police said early investigations suggested that Cr Hill's car was turning right into Alfred Street when it collided with the motorcycle, which was travelling south along Nathan Street.

Senior Sergeant Wilkie said officers would speak to Cr Hill but at the moment she was "distraught".

Police are seeking dashcam footage as the forensic crash unit investigates.

A Townsville City Council spokesperson said the Mayor was treated for shock.

"Our hearts go out to everyone involved in this tragedy," the spokesperson said.