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. :)
@Oliver Schick started
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...you're over the solid line, which are largely ignored until the light is red.