I can understand the point that if you are joining a road the onus is on YOU, but how can you go about, practically, pulling out onto a road when your vision is obscured ?
I face this situation almost every time I go out in my car. I edge cautiously out, nosing slowly out into the road hoping that if the front of the car is seen by another road user, they will alert me to their prescence by judicious use of their horn, but there are people who travel down this road at a fair lick.