Three more motorcyclists have died on the roads of Sussex in the past week, one of them on the A286 at the Henley bends, between Midhurst and Fernhurst.
Police are appealing for witnesses to the incident last Thursday evening involving a 26-year-old man from Chichester.
Steven Eccles, of Woodlands Lane, was the 13th motorcyclist to die in the county this year.
The tally of deaths rose to 15 in the early hours of Tuesday, when a man and woman, aged 30 and 25, were killed in a motorcycle collision on the A259 at Hove.
Thursday's victim was riding a Kawasaki motorbike south, towards Midhurst, when he went off the road at a bend.
Police were called to the scene at 7.40pm. They said no other vehicles were thought to be involved.
The biker lost control of his machine for some reason. An inquest is expected.
His family travelled from their home to Chichester on Tuesday to make a formal identification.
Anyone with information about the incident is asked to contact Sussex Police on 0845 60 70 999 quoting Operation Wansford.
Only a month ago, police urged bikers to do everything they could to make sure family and friends they left behind in the morning would not be mourning their non-return that night.
Inspector Damian Merrifield said after Thursday's fatality: "We have now had another motorcyclist death on our roads and the death toll is rising.
"I understand and appreciate that the weather is perfect for bikers, but we urge them to look out, take that extra bit of care and take their time and give cars and other road users a wide berth."
He also urged drivers of other vehicles to 'think bike'.
"If you're a motorist, check and double check that your next move isn't going to put a motorcyclist or any other road user at risk – everyone has a significant part to play in road safety," the inspector said.
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