Ah, forgot to mention it: to emulate local trade, Markets could also give a trickle. I think this could be an alternative to "limiting the number of Traders considering total enabled route length" to justify their expansion (garrison/ungarrison cooldown could still fix the other things). Best is, with simple rules, to generate something interesting, obviously.

Thanks, I’d really like to see improvements to flying objects, especially those that fly at high speeds.

Yes, but the point was that there are worse problems with trading routes to begin with, which could be solved by limiting Traders per route, and if one wants to make them go to other Markets, that would be harder to analyse. I tried to do it already anyway, for example I thought one could have many Markets, and to reduce micro, the Market screen could show a map with all possible routes, and one would enable or disable them (if some went through enemy territory), Traders taking any enabled route from any Market equiprobably (all to reduce micro, I wouldn't like having to click for every Trader every Market, sometimes more than once if they get disrupted, like this just one click would put them on the allowed network). Still, limit on number of Traders and gains with route length have to be such to have what I think is the ideal algorithm: Markets homogeneously covering the available area, the more Markets the better, but up to certain limit, in my case related to the total amount of Traders one is willing to have. This last bit is hard to get a grasp on if Traders travel to many Markets, that's why just bouncing between two Markets was more than an acceptable simplification to understand the maths, all things considered. Not that it's impossible, but working algorithms are the important bit, after deciding what characteristics for sure people want to be present. To try a working algorithm with random walk, Trader profits could be independent of route length, and Markets have a minimum separation (because of lack of diversity in products and clients), this way they would homogeneously cover the map in hexagonal patterns. Since I don't like hard limits (that's why my Suggestion 56, "Separation criteria", proposes a more flexible approach to Fortress and Tower minimum separation), another possibility could be that the Trader profit has a maximum at the Market separation wanted (long routes have more risks and logistical costs, reducing profits). This would also cover the map in hexagonal patterns (if possible, profits could be indicated when placing the Market, same as height bonus is indicated for the relevant structures). Limiting the number of Traders considering total enabled route length (keeping their average "density" constant, and to disable routes one might need to get rid of some Traders first) would still be needed to justify expansion (on top of all this a trading garrison/ungarrison cooldown could spread Traders better and remove any teleportation exploit in general).   No, and even if you could, it would be way less profitable than making it oscillate between the two furthest points, which is the reason of my post

Hopefully you will even be able to get proper interpolations for flying units next release. https://gitea.wildfiregames.com/0ad/0ad/pulls/9253 I even started this PR when I saw your helicopter video