The collision happened during the evening of Thursday 30 July at the junction with Alton Road, involving a white KTM motorcycle and a red Nissan Pathfinder.

Officers attended, along with the fire and ambulance services. Very sadly the motorcyclist – a man aged in his 20s from Salisbury – was pronounced dead at the scene. His family was informed.

The occupants of the car sustained minor injuries.

Police Sergeant Nikki Burt, of the Serious Collision Investigation Team, said, “We have identified a number of vehicles that were travelling in the area that we would like to trace.

“While I appreciate the images are not of the best quality, I am hoping they may jog someone’s memory if they were travelling in the area around the relevant time.

“I am appealing to anyone who was driving any of the vehicles pictured to please get in touch as you may be able to help the investigation.

“I would like to extend my appeal to anyone that was on Wallisdown Road between the University roundabout and Wallisdown roundabout between 6pm and 6.20pm on Thursday 30 July and may have seen a 4×4 vehicle, a motorbike or the collision itself to contact the investigation team.”

Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email SCIT@dorset.pnn.police.uk or by calling 101, quoting occurrence number 55200112419. Alternatively, or alternatively to stay 100 per cent anonymous, contact the independent charity Crimestoppers online at Crimestoppers-uk.org or call freephone 0800 555 111.