What am i doing wrong with districts?

I am trying to get iron from my top right district to go to my chips and appliances district and… they just dont go. i tried clicking the iron icon and draging from iron over to the chips, but the iron just sits in the mines

Silly question, you don’t have any one way roads in that connection line do you? Are any of them reversed? Even perhaps a small almost unseen connection can cause issues like this.

odd thing is, i replaced the 1 way highway with a 2 lane because i thought maybe i missed something. i will do the same with the 1 way roads from the mines and get back to you.