I [XXX] was driving at around 50mph with 100% visibility and in few seconds I got in to fog ( see pic shows clear condition ). I took of the accelerator and tesla slow down but not like it normally does auto braking ( hold mode ). The car in front of me that I didn't see was in the dense fog section in full stopped state and I crash into her. With no visibility and driver in front in full stop condition I could not avoid accident. I had no time to react. At the time crash my speed might be around 10/15mph. The point I am trying to make is Tesla Y model which is using Camera based collision prevention didn't delect car in front of me maybe because of fogged camera. Tesla Y didn't warned me for collision to avoid car crash. Tesla Y also blanked out on screen, didn't show me lanes which in normal case does. On the screen usually it show all the car moving around plus the object around the car but it didn't display anything. Tesla Y completely fails in foggy conditions as it uses camera to detect and we crashed with no warning or auto braking. I have recordings from all four cameras recorded and also collision. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)