Re: Crossing loop design (r.e. Southern Aurora crash)

[krel4203@netconnect.com.au (Krel )]

>>This raises an question of interest, namely what signaling schemes are used
>in Aus.
>
>NSW is simple - the top aspect tells oyu if you can pass THAT signal - the
>bottom one gives you warning of the next one.

It is like having a Home above a Distant on the same post.

>Basically - NSW has two aspect signalling in MOST heavily trafficked areas -
>providing Green (G), Yellow (Y) and Red (R) in both aspects.
>
In Victoria this is called three aspect signalling. There are two
lights that can show up to seven combinations:-
G/R - clear normal speed		"Top Green" in driver speak.
Y/R - normal speed warning		"Top Yellow"
R/R - stop			"On the red"
R/Y - medium speed warning	"Bottom Yellow"
R/G - clear medium speed		"Bottom Green"
Y/G - reduce to medium speed	"Reduce"
G/Y - clear on a repeating signal (a repeater in Vic is like a
distant).
At some locations only one light is used. This is called two position
signalling. The aspects are
G - clear
R - stop
In 2 pos areas signal that have no stop indications are called
distants (cf repeaters in 3 pos). These show only:-
G - clear
Y - caution
Only distants can show caution, all other yellow lights indicate
'warning' (no one seems to know why)