The family of a Rochester biker who crashed at roadworks on the Isle of Man believes no one has been brought to justice.

Amateur racer Alan Osborne, 59, was travelling at up to 100mph on his Suzuki bike before he crashed on the Mountain Mile.

The gas engineer of Beaulieu Rise, was preparing for race season on the island road, which had no speed limit, when he hit the back of a trailer which was waiting to pass roadworks.

Witnesses said he had just seconds to brake for a hand-held stop sign on a bend. His bike slid into a van's trailer and he died of his injuries.

Works sub-foreman Brian Tomlinson was charged with manslaughter and failing in a duty of care after the accident on May 14, 2007.

Mr Tomlinson, then 61, pleaded guilty to the duty of care charge in an Isle of Man court last March, but he was let off with an absolute discharge. The manslaughter charge was dropped.

This meant an inquest into Mr Osborne's death was finally closed after four years on Thursday.

The biker's widow Sue, 63, is now pursuing a civil case against the island's Department of Infrastructure.

She said: "He knew that course like the back of his hand. The blame lies in the signage.

"This has changed our lives. He was an absolutely lovely man."

The inquest heard from friends of the biker, who said they had ridden thousands of miles with him and never felt in danger.

Daughter Shelley, 32, added: "Dad could do that course with his eyes closed, but we feel like he's been blamed for the crash. We're as devastated now as we were then."

The inquest at County Hall, Maidstone, heard Mr Osborne had been blind in one eye since birth, though a report ruled it had not affected his judgement.

Police motorcycle tutor Sgt William Lace, who studied the video footage second-by-second, said Mr Osborne's actions were "typical" but added his speed and overtaking had been excessive.

The court also heard statements from other drivers, including one whose car was clipped by the biker minutes before the fatal crash.

Coroner Patricia Harding said: "It is quite clear from the evidence that your husband was driving at quite high speeds. It is also quite clear he did not see there were road works, and the signage was inadequate. He tried to slow down but tragically, he was not able to do so in time."