To stop motorists getting T-boned, Transport for NSW decided to install traffic lights at the intersection with Springhill Road.

"During a five-year period ending December 31, 2017, there were seven crashes resulting in injuries within 10 metres of this intersection," a Transport for NSW spokesman said.

"In those crashes, 14 people were injured - including seven seriously injured."

The decision surprised many Illawarra motorists, who felt there was no need to install lights.

They felt that motorists turning right into Springhill Road had a clear view of oncoming traffic as far as 750 metres away.

They could not understand how a driver could get hit and felt traffic lights would only create delays.

However, in June Ann Fanning spoke up about being injured in a crash when a vehicle turned right in front of her, and she collided with him.

"He came straight out of Keira Street," she said.

"He didn't brake or anything. He just came straight out and I T-boned him."

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She suffered a neck injury that saw her take several months off work.

The new lights will control traffic looking to turn right out of Keira Street as well as vehicles travelling west along Springhill Road.

Left turns out of Keira Street will remain as-is and westbound traffic along Springhill Road will also be unaffected.

The Transport for NSW spokesman said the lights would be synchronised with those 200 metres west at the Springhill Road-Bridge Street intersection.

"Transport for NSW continually monitors the operation of this intersection and other intersections along this critical corridor to ensure safe and reliable journeys for all road users," the spokesman said.

"Springhill Road through Coniston is a major freight and public transport corridor and therefore priority is given to reducing delays for road users, especially heavy vehicles."