2005 Layout - Part 1

[Peter]

Could you please check out my new attachment in this reply for transition zone from 4-aspect to 3-aspect?

Your attachment shows it clearly. Remember though that while for a 4 aspect sequence, the YY to R distance needs to be at least BD, the actual spacing of the four aspect signals does not have to be completely uniform (there is a one third / two thrirds rule) and as such, if your final four aspect signals is actually less than 0.5 BD from the first three aspect signal and your Y>R on the first 3 aspect section is not much more than BD, you could still show a YY at the last four aspect and still satisfy the requirement for not being too much over braked.

You have put a ROL on 118 signal which is not the correct use of ROL - it is for a warner route up to a convergence, not for bringing a signal closer to a facing junction.

Yes I agree with you. If I understand well, I need to position the signal 118 at 2700 to have a full overlap 180m. Could you please explain me the function of ROL? As I understand, the benefit is to have another opposing route can be set when the point is not locked. Am I right?

You could do that, or you could put it where you have and implement a swinging overlap (ie allow an overlap though both the N and R lie of the points.
ROL is used where you have a trailing set of points in the overlap which may not be available because of another move. You control the speed of the train on the approach to the ROL by using a warning class of route (approach release from red) at the signal in rear. The former Railway Group Standard has some explanation on restricted overlaps which should help you.

Peter