In 1999, I almost hit a car like that.
It was a state highway with 60mph speed and for some reason I didn't notice it until it was too late.
It was sunny and the car was waiting to make a left and I thought it was moving.
I think being sunny and dusty brake lights plus stupid red light brakes made it not noticeable.
Side note: I really hate cars with red brake light blinkers.
Manufactures are stupid and dumb to make red blinkers and a safety risk.
Yellow lights are noticeable from far even in bright sun compared to red brake lights.
That's the reason all cars I ever owned had/have bright yellow signal lights and the one I owned with brake light blinkers, I changed it to yellow.
Anywho, I 99% hit the car and would have killed them and myself if there were no shoulder.
I drove on the rough shoulder at close to 60mph and avoided a crash.
You don't expect a car would be completely stopped in a high speed road or you don't expect a car that you saw moving from far would be stopped completely.
Left turn like that without a turn lane is dangerous and stupid red signal lights just adds more risk.