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I will preface this by saying I have very little idea of what I'm doing with this game despite how long I've played it. I've been playing this save since the Hazards update dropped and I've ran into a situation I can't figure out from any guide I've read thus far. For some reason my logistics aren't fully getting through to my two armies in the south. I've looked back through the logistics section in the manual, the two logistics guides on Steam, and messed around with truck stops in an attempt to fix it but nothing has seemed to work. I figure I'm doing something wrong but for the life of me can't figure out what, can someone help me figure this out? Attached are a screenshot and the save file.

I presume you're referring to the fact that some of the southern forces food requests are not being fully fulfilled. I went into the SHQ Admin page and bumped up the SHQ => Unit limit to 40% (was 30%). I then played forward a turn and all the food requests were fully fulfilled. This is discussed briefly in section 3.8.1.9, but I've never really seen a deep discussion about managing SHQ logistics limitations.
-Mark R.

I'm going to rescind my previous answer, because I tried playing it forward a second, but this time leaving the settings the way you had them and all the units got supplied anyhow. Perhaps I don't understand the problem you're having.

I had a look at your save. From my perspective, it seems you didn't have enough logistics points going down the southern road when compared to how much demand there is.

It seems the turn previous you managed to rack up a demand for 2.4k+ logistics points, which I'm guessing is as a result of you attacking with everything you have in the vicinity on the city of Picard. This means for this turn, there was not enough logistics points available (only 1765) to meet the requirements of all your troops, which resulted in a bottleneck. The reason I know this is because I clicked on the "Used Points" overlay (as shown below)(Initial points also shows this). The reason the bottleneck ends at that specific point is because that is where the supplies start coming off the logistics network and into your units, which means the rest of the road now has it's logistics points freed up to go back into the network. Current pts tab shows you how many points are available. Preview pts tab shows you next turn's demand, which will be 950 logistics points as long as you don't do any action this turn that would then require more logi points, such as another attack. The demand on the turn after that will likely be minimal because your units will be fully stocked on ammo and your Truck station III will be operational. (@mroyer, I'm fairly sure the problem is ammo demand centred that's flooded the logi network rather than food, but bottlenecks don't discriminate on what supplies get restricted hence low amount of food getting into the units).



Solutions:
- Upgrade truck station to get more logistics points (which I see was what you were already doing). Make sure you have enough fuel in stockpile or in income otherwise the amount of logistics points will fall.
- Divert traffic from areas that don't need as much logistics points to the south. Block useless roads or roads with limited demand (uncheck the pull points button on the blocking traffic screen if you want certain roads to only take demand and nothing else on 100% blocked roads) so that as many logistics points as possible goes to the desired direction.
- Reduce demand by pulling away units or use less resource intensive units (or use more resource intensive units less frequently). I'm fairly certain that your artillery regiment is the primary cause of these bottlenecks because of it's huge ammo consumption (I test fired it onto Picard and the demand for next turn went up to 4k ). Alternatively, research techs (such as gas powered weapons, or lower calibre guns) that use less ammo.
- Change SHQ maximum logistics limitations? (not really sure if it's a viable solution as I've never used it, but the option is there).

If it were up to me, I'd just keep going with the truck station upgrade and then scale back the arty back down to battalion size. You're well on your way to taking Picard anyway without needing that ammo sponge and it seemed like you were about to fix the logi problem anyway as mroyer demonstrated.

Hope what I've said is accurate and that it helps.

I've been shelling with the arty practically every turn now in an attempt to wear down their forces, the MG Inf has only been fighting defensively with the tanks pushing weak points. I got the drone spotters and thought that my logi network could take the load of upgrading it as I hadn't actually made anything larger than a Battalion before this save. The ammo taking up most of the logi draw makes complete sense as some of my troops were starving and getting pushed back because of the lack of food, wish there was a priority system for logi resources but oh well. The main thing that was confusing me was the massive red section on the Bottlenecks view as I thought that meant the logistics points had gone beyond the truck station's free ap allotment or something was limiting it's flow, but ofc it's just been me throwing more shells at a problem . Thank you both for your help.

I had a very similar problem with bottlenecks and after reading the replies, I'm pretty sure it was much the same situation as in the original post.

Just taking the opportunity to second reddragonfall's thanks to you both for clarifying and helping me understand what was going on:)