[spoiler=Braid]Blueprint string: [url=https://pastebin.com/VSQj7DCi]Right hand drive[/url]
Throughput: Set 1: 73 Set 2: 75
Deadlock notes: Needs 10 trains in the right place, two of which change path, to deadlock
Scaling notes: All the buffers need to be adjusted to fit the longest trains, posted is 6 car
Version tested: 0.17.50
Original by: [url=https://forums.factorio.com/viewtopic.php?f=194&t=46855&start=260#p309577]Zijkhal[/url]
[img]https://i.imgur.com/AQbaGMJ.png[/img][/spoiler]
[spoiler=Cloverleaf]Blueprint string: [url=https://pastebin.com/gNGEWXn0]Left hand drive[/url] | [url=https://pastebin.com/84yrbP51]Right hand drive[/url]
Throughput: Set 1: 42 Set 2: 52
Deadlock notes: Even though only one train needs to change path there needs to be another train already on the leaf for the deadlock to occur.
Scaling notes: The "leaves" need to be scaled to longest train.
Version tested: 0.17.45
Original by: Dr. Walrus (submitted via PM)
[img]http://i.imgur.com/WXFQfhZ.jpg[/img][/spoiler]
[spoiler=Improved-er reverse roundabout]Blueprint string: [url=https://pastebin.com/W9NdgLvg]Left hand drive[/url] | [url=https://pastebin.com/s38YKDMm]Right hand drive[/url]
Throughput: Set 1: 47 Set 2: 49
Deadlock notes: 2 opposing trains changing from long turn to straight/short turn
Version tested: 0.17.45
Original by: [url=https://forums.factorio.com/viewtopic.php?f=194&t=46855&start=240#p302835]ridesdragons[/url]
[img]http://i.imgur.com/pYSSkpn.jpg[/img][/spoiler]
[spoiler=Encircled compact]Blueprint string: [url=https://pastebin.com/kNyJniPG]Left hand drive[/url]
Throughput: Set 1: 46 Set 2: 48
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
Original by: [url=https://www.reddit.com/r/factorio/comments/6rttid/totally_not_overengineered_intersection/]maciekmm[/url]
[img]http://i.imgur.com/TOsx6Hu.jpg[/img][/spoiler]
[spoiler=Compact attempt]Blueprint string: [url=https://pastebin.com/jKDJFC3X]Left hand drive[/url] | [url=https://pastebin.com/HNE1DPSL]Right hand drive[/url]
Throughput: Set 1: 33 Set 2: 31
Deadlock notes: 2 opposing trains changing from short turn to long turn
Version tested: 0.17.45
Original by: maurojunior2011 ([url=https://forums.factorio.com/viewtopic.php?f=194&t=46855#p271803]info[/url])
[img]http://i.imgur.com/P6vTueI.jpg[/img][/spoiler]
[spoiler=Spiral]Blueprint string: [url=https://pastebin.com/0bzr7NK3]Left hand drive[/url] | [url=https://pastebin.com/RupNJTLh]Right hand drive[/url]
Throughput: Set 1: 41 Set 2: 43
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
Original by: [url=https://www.youtube.com/watch?v=dBotQHoy818]SirCaptainCrumpet[/url]
[img]http://i.imgur.com/NnlsGfW.jpg[/img][/spoiler]
[spoiler=No Gods]Blueprint string: [url=https://pastebin.com/djE4gXHu]Left hand drive[/url]
Throughput: Set 1: 50 Set 2: 49
Deadlock notes: Forcing a hard path change will likely lead to a deadlock with any but the minimum amount of traffic
Scaling notes: all buffers should be scaled for longest train, posted is 6-car
Version tested: 0.17.50
Original by: aaargha
[img]https://i.imgur.com/L43S6lN.png[/img][/spoiler]
[spoiler=Wide crossover]Blueprint string: [url=https://pastebin.com/eAzP6jJJ]Left hand drive[/url] | [url=https://pastebin.com/VhJWsgfF]Right hand drive[/url]
Throughput: Set 1: 42 Set 2: 49
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
Original by: [url=https://forums.factorio.com/viewtopic.php?f=18&t=43232#p253244]impetus maximus[/url]
[img]http://i.imgur.com/kQi52lJ.jpg[/img][/spoiler]
[spoiler=Squareabout]Blueprint string: [url=https://pastebin.com/m3vjHve7]Left hand drive[/url] | [url=https://pastebin.com/7wJqwe9w]Right hand drive[/url]
Throughput: Set 1: 40 Set 2: 47
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
Original by: [url=https://www.reddit.com/r/factorio/comments/5osisq/yet_another_4way_junction_rhd/]Daughie8[/url]
[img]http://i.imgur.com/QwVcgAj.jpg[/img][/spoiler]
[spoiler=Rotary]Blueprint string: [url=https://pastebin.com/CTCcgeAQ]Left hand drive[/url] | [url=https://pastebin.com/HGiRQCfW]Right hand drive[/url]
Throughput: Set 1: 38 Set 2: 42
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
Original by: [url=https://www.reddit.com/r/factorio/comments/5tsvp3/is_this_junction_reasonable/ddq58qg/]aaargha[/url]
[img]http://i.imgur.com/t8r9GMG.jpg[/img][/spoiler]
[spoiler=Crossabout]Blueprint string: [url=https://pastebin.com/YXvytju8]Left hand drive[/url] | [url=https://pastebin.com/REF8fWBL]Right hand drive[/url]
Throughput: Set 1: 44 Set 2: 45
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
[img]http://i.imgur.com/CYEvNV8.jpg[/img][/spoiler]
[spoiler=Reversed roundabout]Blueprint string: [url=https://pastebin.com/YFrnnaVm]Left hand drive[/url] | [url=https://pastebin.com/5unc4Kuz]Right hand drive[/url]
Throughput: Set 1: 38 Set 2: 37
Deadlock notes: 2 opposing trains changing from long turn to straight/short turn
Version tested: 0.17.45
Original by: [url=https://forums.factorio.com/viewtopic.php?f=194&t=46855&start=220#p301531]ridesdragons[/url]
[img]http://i.imgur.com/MTmZruX.jpg[/img][/spoiler]
[spoiler=Roundabout]Blueprint string: [url=https://pastebin.com/Wzb5Ej1F]Left hand drive[/url]
Throughput: Set 1: 36 Set 2: 40
Deadlock notes: 2 opposing trains changing from straight to long turn
Version tested: 0.17.45
[img]http://i.imgur.com/2qVT0Qg.jpg[/img][/spoiler]
[spoiler=Buffered roundabout]Blueprint string: [url=https://pastebin.com/jWSnLdAt]Left hand drive[/url] | [url=https://pastebin.com/3Z4Fw6Uz]Right hand drive[/url]
Throughput: Set 1: 34 Set 2:  39
Deadlock notes: There exists at least a 4 train right (on RHD) to straight/left deadlock. There are probably more possibilites but this one is annoying as heck to reason about. Signalling is delicate, altering it may drastically worsen deadlock rating.
Scaling notes: Sides need to be scaled for longest train.
Version tested: 0.17.50
Original by: [url=https://www.reddit.com/r/factorio/comments/6i2gnw/weekly_question_thread/dj4ypj4/]mrbaggins[/url]
[img]http://i.imgur.com/OF6DjHu.jpg[/img][/spoiler]
[spoiler=Minimal]Blueprint string: [url=https://pastebin.com/8aam6xBW]Left hand drive[/url] | [url=https://pastebin.com/kHYmwY3C]Right hand drive[/url]
Throughput: Set 1: 34 Set 2: 32
Deadlock notes: 2 opposing trains changing from long/short turn to straight
Version tested: 0.17.45
Original by: [url=https://forums.factorio.com/viewtopic.php?f=194&t=46855&start=220#p301195]lee1026[/url]
[img]http://i.imgur.com/M5QjTIO.jpg[/img][/spoiler]
[spoiler=Curly]Blueprint string: [url=https://pastebin.com/3sxdANZ5]Left hand drive[/url] | [url=https://pastebin.com/fbcF4EbE]Right hand drive[/url]
Throughput: Set 1: 24 Set 2: 27
Deadlock notes: 2 opposing trains changing from straight/short turn to long turn
Version tested: 0.17.45
Original by: [url=https://www.reddit.com/r/factorio/comments/5r647p/two_lane_four_way_junctions_to_pass_the/]SirCaptainCrumpet[/url]
[img]http://i.imgur.com/5mAedok.jpg[/img][/spoiler]