Mobile phone detection cameras will soon be installed on North East Rd in Valley View and Payneham Rd in Felixstow.
Construction of the two new gantries needed for the cameras will begin soon, with the system expected to be operating by mid-2026.
The new sites were selected based on their high traffic flow and data by the Adelaide University's Centre of Automotive Safety Research.
They follow the introduction of mobile phone detection cameras in South Australia last year at five locations, which have caught close to 80,000 drivers doing the wrong thing.
The Regency Park camera has snapped the most distracted drivers, with 21,000 expiation notices issued.
Unlike the rollout for the first five cameras, there will be no educational period for the two new sites. Penalties include fines of $573 (plus $105 victims of crime levy) and three demerit points.
All money raised from the fines go into the Community Road Safety Fund, to deliver crucial road safety initiatives across the state.
SA Police Assistant Commissioner Ian Parrott said using a mobile phone while driving was "irresponsible".
"It will cost you financially and the distraction could cost your life," he said.
"Secure your phone safely before you start your journey, if it falls or dislodges it can easily become an unnecessary distraction while you’re driving."
Department for Infrastructure and Transport Chief Executive Jon Whelan said a person was more than four times as likely to be involved in a crash if using a mobile phone while driving.
"The best outcome would be for these cameras not to generate any money through fines. I’m hopeful that they will continue to act as a strong deterrent and make sure people do the right thing," Mr Whelan said.
"Being distracted by a mobile phone for two seconds at 60km an hour means a driver travels 33m without their eyes on the road. This jumps to 55m if they are travelling at 100km an hour."
The cameras capture high-quality images from multiple angles through the driver’s windscreen, with artificial intelligence software identifying drivers that are using a mobile phone.
All images of potential offences are then validated by SA Police.
Work on stage three of the detection camera rollout is progressing, with the Department for Infrastructure and Transport working with SA Police to identify suitable sites for a further 15 cameras across six locations.
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