I am using sticky pistons - I don't see how a sticky block would help unless there is a sticky fence which I don't see (or other similar-type like iron bars, etc.). I certainly can't do a line fence-stickyblock-fence-stickyblock-fence-stickyblock-fence-stickyblock-fence, takes up too much space and looks ugly. If I'm mistaken about how sticky blocks work please enlighten me.
Minimum block space is 3 block-widths (road width) with raise/lower mechanism above, max is 5 block-widths with raise/lower mechanism at the end positions. - all occupied by fence, iron bars, etc.. I really would like a 2 block-height with a push/pull 2 block-height (the minimum walk-through height) but I understand sticky-pistons have a 1 block-height for push/pull inherently designed into them, thus the fence-gate work-around under the portcullis, annoying but workable. I would prefer to put everything underground but that doesn't seem to be an option. The current version of the portcullis works - I'm just asking if anyone has an improvement on it OR can make the original concept (my first post) work by putting the mechanism underground with pistons AT THE ENDS ONLY. People don't seem to understand what I'm saying and I am VERY clear in my communications. Do you understand what a portcullis is? What it does? Can you build a better version? Pictures/description/diagram/schematic please.