A CYCLIST has died and a young learner driver is assisting police after the man came off his bike while trying to avoid a car and instead slid underneath the girl's car.

At 7.55am on Wednesday the 45-year-old from Frenchs Forest was riding as part of a pack of six on Kissing Point Rd at South Turramurra.

Ku-ring-gai duty officer Inspector David Hogg said a car began to reverse out of a driveway which caused traffic to slow down.

"The cars were stopped to let the car reverse out,'' Insp Hogg said. "The bike rider has come around the corner and swerved to avoid the cars .''

He crossed onto the wrong side of the road, came off the bike and slid under the car which was travelling in the opposite direction.

"He was going down the hill and has just slid right under the car going up the hill in the opposite direction,'' Insp Hogg said.

Cyclists on bike riding forums have described the stretch of road as dangerous with calls for warning signs to be placed on Kissing Point Rd.

Witnesses rushed to perform CPR on the man.

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A NSW Ambulance spokeswoman said the man had severe head trauma and had suffered cardiac arrest as a result of the accident. He was taken to Royal North Shore Hospital in a critical condition and later died as a result of his significant injuries.

Police inquiries are continuing but Insp Hogg said at this stage they do not expect to lay any charges against the 17-year-old driver from Carlingford.

"The driver and her supervisor were taken to Hornsby Hospital for mandatory blood and urine testing but that is just a standard procedure and at this stage of inquiries we believe the rider was at fault.''

The road was closed in both directions during the morning peak and diversions were put in place.

A website known as Sydney Cyclist posted a story on the incident. Several people immediately responded with concerns about the dangers for cyclists on this stretch of road which is very popular among riding groups.

"Given the speeds cyclists can (and do) descend there, not much hope of stopping,'' MadameBike posted on Sydney Cyclist. Another described it as a "dangerous piece of road'' while poster Bob Moore called for Watch for Cyclist signs

Originally published as Cyclist dies after sliding under car