When filled I can point the way. But when empty unmoving I stay. What am I?

Answer: glove

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When I am sad, I change colour from white to grey. My tears fall to the ground and my cries are low and rumbling. In my anger I send great flashes of light above. What am I?
When I point up it's bright, but when I point down it's dark. What am I?
When I point up, it’s bright. When I point down, it’s dark. What am I?
When I take five and add six, I get eleven, but when I take six and add seven, I get one. What am I?
When I’m first said, I’m quite mysterious, but when I’m explained, I’m nothing serious. What am I?
When it comes to me, you go on red and stops on green. What am I?
When people can control me, people love me. When people lose control of me, people fear me. I cast shadows, but have no shadow myself. What am I?
When set loose, I fly away. Never so cursed, as when I go astray. What am I?
When you are inside me, you will be encouraged to slam other cars. What am I?
When you do not know what I am, then I am something. But when you know what I am, then I am nothing. What am I?
When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am I?
When you take away the whole from me, there is always some left. What am I?