Looking at the diagram supplied by Danny raises the question of just how do you check for approaching landing traffic when entering from a holding point which has that traffic 135 degrees behind your heading.
If there's not enough room to turn the a/c to look over the approach path, do you open the cockpit window, stick your head out and have a look behind -- or do you entrust the lives of you and your passengers to ATC?
In case of collision with landing traffic when entering the active from a blind holding point in accordance with an ATC instruction, who is responsible? -- bearing in mind that determination of legal responsibility where there's loss of life is a bit of a hollow exercise