Hey there!
I've been running a Bob's playthrough with this for a while, and I absolutely love the concept. It's saved me a whole bunch of grief. However, the underground pipe nodes still have collisions (even though they look like they shouldn't) and I kept running into them with various vehicles. It drove me nuts, and I eventually dug into the files to find out what was wrong. Turns out your collision settings are just being set to nil, because by the time you define them the pipes have already attempted evaluation. The fix is super simple, just a reorder of data.lua to put your definitions of afh_ground_only and afh_space_only before all your require statements. Personally, I removed the "player_layer" line too, but that might be better as a startup setting - up to you, really.
If you want me to post the code or anything, just let me know!
Thank you for the awesome mod!

Oh man, I completely forgot about that part when I wrote the space exploration compatibility. Hmm..

It seems collision wasn't fixed, or was it bugged again? Because I just test-driven into and totally ruined them. Angel+Bob mods, no Space Exploration.

Hi there ! Having same collision problem. Crashing with cars in "underground pipes"
Running factorio with angel+bob now with factorio version 1.
previous runs with 9.x and all the angel+bob+ whatever, there were no problems. I've been using advances fluid handling for years now,
thanks, by the way.

I'm working on figuring out what's going on now.

This SHOULD be fixed. I made a space exploration game and tested it by hand to ensure I could walk over them with my character on the surface and in space.