Oops replied too late.
thanks, XKnight, that was what I was looking for.
Neat way of separating the lanes.
Thanks!

No, That won't work, because if demand comes only from e.g. the right lane, a full belt will cause this:

and nothing will be gained.

Hi, I'm trying to find a good demand rebalancer, by which I mean the following:
Consider a full transport belt (both lanes) and suppose that only one lane is being emptied further down, I want to spread that demand over both lanes.
Flow diagram:
-->| demand |oooo
-->|rebalancer|---->

My current ...