(04-08-2014, 06:23 AM)asrisaku Wrote: Another attempt, and try best to practice
Best regards, Arnut
Please see attached comments- sorry it has taken so long for me to find the time.
Note that the UK mainline does not ever use the sequence G-YY-Y-Y-R.
However consecutive double yellows G-YY-YY-Y-R is used (but only where we really have to).
I do like your idea of colouring the question paper to get a clearer view of how distances compare to braking distance and the form of sequence to be used; do remember however that your answer paper will be photocopied in black and white before being sent to examiners and you are told not to use colour differentiation in your answer.
There is a comment from you I cannot really read- I think it asks whether to show a swinging overlap on an aspect sequence chart- NO. The Control Tables etc give details of swinging overlap controls but for consideration of SEQUENCE then this is irrelevant. A Red will a full overlap is a Red with a full overlap and the diagram is to show the warning given to the driver at previous signal(s).
A Red with a ROL is different because the risk associated with a SPAD is greater and this is mitigated against by making the signal in rear more severely approach releases and therefore this IS significant for an aspect sequence chart.
I have made more detailed comments on the 2nd file, marking the cummulative distance as I worked back from each Red to check the attempted solution and amending the diagram where I feel it needed correction.
Do also have a look back up this thread where Reuben has provided what he believes is the model solution together with a commentary on that.
PJW