Secondly, amber have the same meaning as red
^ As you've just quoted yourself, Ed, the meaning isn't quite the same, as it also includes the additional caveats you've included in the quote. Red is 'stop, no ifs or buts'. Amber is 'stop, except when ...'.
Amber is 'stop, except when ...'
...you're over the solid line, which are largely ignored until the light is red.
Yes, as Brun quotes, 'stop, unless you can't stop safely'.
When you're already over the solid line, none of this matters, anyway, as, erm, you're already over the solid line. :)
@edscoble started
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^ As you've just quoted yourself, Ed, the meaning isn't quite the same, as it also includes the additional caveats you've included in the quote. Red is 'stop, no ifs or buts'. Amber is 'stop, except when ...'.