> In some countries, they put green+yellow means it's about to go red,

We (UK and Germany and most other countries I've been to) have just solid 
amber to mean it's about to go red.  It's illegal to go through on red and 
you will be fined (or photographed then fined!), so the amber is needed to 
give people a chance to stop before it goes red.  Faster roads have longer 
amber phases to avoid you needing to do an emergency stop in fear of running 
a red.

> and red+yellow means it's about to go green. Sounds dangerous to me, 
> doubly-so if it really means you are allowed to go thru on red+yellow.

Technically you are not allowed to go through on red+amber, it means "ok 
green is going to come on in about 1 second so make sure you're in gear and 
ready to go".  Under normal circumstances if you just begin your "pull away" 
sequence when the red+amber comes on you'll cross the line as it turns 
green, so no problems.

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