what is signal aspect diagram

[onestrangeday]

Hi signal professionals:

I am still new to the signallling industry.
I have few questions as follow

1. " what is signal aspect diagram" ?

2. is "signal aspect diagram" = "signal aspect sequence"

3. can anyone provide a copy of 'signal aspect diagram' or "signal aspect sequence", i have no idea what's looks like ?

4. how would you draw out the aspect sequence for all the signals a driver would see before reaching a red signal.
thanks
william

I consider they are one and the same; I generally call them Aspect Sequence Charts but sometimes Diagrams.

You will find an example of several attempts posted on this website; look at the attachments for the posts in this section.

Look at these diagrams and you'll see the horizontal lines that join the aspect of the signal ahead being joined to the one which reads up to it and thereafter to the signal whiich reads up to that one. In that manner the extent of the restrictive aspects displayed on the approach to a signal at red can be clearly be identified.

Although aspect sequence nowadys is primarily in Module 3, it is the Module 2 Study Pack which has the information (for historical reasons reflecting the fact that the exam used to be divided slightly differently)

Hi PJW:


thanks for your explanantion. I have looked the past post. but i still don't understand (i think i only have a general idea,but i would like to know more in detail), can you explain more in detail ? or do you know where i can get more information from ? (books ??)


thanks


william