As long as you have your side mirrors you are fine. i have a reversing camera and one of the reverse mirror screens so can see out the back all the time - works well but I find you lose the clarity of anything more than say 100m behind you, whereas a mirror gives greater detail I find. @Cuppa put me onto mine, got it off ebay - of course! I do need to now add a rain hood to stop the camera getting wet and blurring the image further