Hi, dorfl.
About gates... i cant make circuit to open the gate when a cart is arrive. I dont have any idea how to open it automaticaly. So can we have a Gate Opener item that can we place into the cart grid and when the cart is there at the gate that is simply opens it.
My other suggestion about the underground belt tunnels. Its a brilliant idea. But can we get a new item called cart tunnel or something like that? I think its way more better than the underground belt.

Yeah, gate handling is a bit obscure, mainly because it's about the oldest code in the mod and was designed to stop carts based on external circuit activity, not so much to auto detect carts and then open.

You can currently detect a cart using a constant combinator next to the path just before the gate (cart sends its C(n) id signal to the CC while passing), and from that and an adjacent wall trigger a gate opening. May need a bit of a delay built in with a timing circuit.

The gate opening equipment is an interesting idea...

Thanks the help, i will try to do that.