Traffic flow on 15 Different 8-way Intersections (and alternatives) Measured, Ranked and Compared.

UPDATE: Feb 2021: Gotten more views over the last few weeks & loads of people have mentioned that improved lane mathematics would have greatly improved some of these intersections. This is true, but then I would have had to make structural changes to the intersections and my intention was to test the intersections exactly as intended by their creators, although I did use TM:PE to manage lane changing.

Check out this intersection comparison in Steam Guide form: https://steamcommunity.com/sharedfiles/filedetails/?id=2254655213

In this video I rank and compare 15 different 8-way intersection designs (including two alternatives) to see how they perform under 3 different initial traffic conditions, namely, "light", "Moderate" and "Heavy" traffic scenarios and ultimately find the best.

To do this I used Cities: Skylines, Traffic Manager President Edition (TMPE) the Mass Transit mod, Network Extensions 2 DLC and a small custom mod I wrote to count vehicle numbers over time.

Chapters:
0:00 Intro

0:15 1. "Standard 8-Way, no Traffic Lights"
0:59 2. "Standard 8-Way, Traffic Lights"
1:30 3. "Large Roundabout with slip lanes"
2:15 4. "8-way magic roundabout" by "Tremor"
2:55 5. "8-way Double-Roundabout" by "RichAntDav"
3:39 6. "8-Way Highway Interchange" by "RobinSinouh"
4:22 7. "8 way snowflake interchange #2 (double cloverleaf)" by "3nƒ0я¢3я"
5:28 8. "8-Way Quad Roundabout v2" by "RichAntDav"
6:17 9. "8-way Ultra Interchange" by "bubbac2005"
7:08 10. "8-Way Double Cloverleaf" by "RichAntDav"
8:03 11. "8-Way Highway Intersection" by "Jazumojo"
9:04 12. "8 Way Highway Interchange" by "FightBiscuit"
10:09 13. "8 Way Interchange" by "General Grievous"
11:11 14. "Four 3-Way and one 4-Way intersections"
12:17 15. "Four 4-Way intersections"
13:23 Outro

Details:
1. Standard 8-Way, no Traffic Lights
Size: 10x10
Cost: 6,400
2. Standard 8-Way, Traffic Lights
Size: 10x10
Cost: 6,400
3. Large Roundabout with slip lanes
Size: 58x58
Cost: 18,240
4. 8-way magic roundabout
Creator: Tremor
Size: 56x56
Cost: 47,932
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=407431163
5. 8-way Double-Roundabout
Creator: RichAntDav
Size: 64x64
Cost: 108,530
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=2169460437
Youtube: https://www.youtube.com/watch?v=JTPGrkxb9K0
6. 8-Way Highway Interchange
Creator: RobinSinouh
Size: 64x64
Cost: 106,880
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=437501820
7. 8 way snowflake interchange #2 (double cloverleaf)
Creator: 3nƒ0я¢3я
Size: 92x92
Cost: 170,010
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=634165703
8. 8-Way Quad Roundabout v2
Creator: RichAntDav
Size: 64x64
Cost: 98,300
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=2220063453
Youtube: https://www.youtube.com/watch?v=j63PypGc5Fg
9. 8-way Ultra Interchange
Creator: bubbac2005
Size: 64x64
Cost: 139,230
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=575855595
10. 8-Way Double Cloverleaf
Creator: RichAntDav
Size: 84x84
Cost: 190,540
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=2212974143
Youtube: https://www.youtube.com/watch?v=rBExs0z4ANY
11. 8-Way Highway Intersection
Creator: Jazumojo
Size: 188x188
Cost: 460,090
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=1922371068
12. 8 Way Highway Interchange
Creator: FightBiscuit
Size: 180x180
Cost: 394,009
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=814600324
13. 8 Way Interchange
Creator: General Grievous
Size: 100x100
Cost: 251,000
Steam: https://steamcommunity.com/sharedfiles/filedetails/?id=1802679037
14. Four 3-Way and one 4-Way intersections
Size: 72x72 (just intersections) or 130x130 (total)
Cost: 199,750
15. Four 4-Way intersections
Size: 80x80 (just intersections) or 150x150 (total)
Cost: 237,240

Notes:
The first 13 intersections are not strictly in order of performance, because we would really need 3 different sets of rankings (one for each scenario type). This is because while one intersection may perform better than another at the "medium" traffic level, it could perform much worse at the "High" traffic level. An example of this would be no. 8 which, because of it's reliance on roundabouts, it performed well at the "medium" level, but collapsed at the "high" traffic level and had worse performance than earlier intersections. So the ranking is not strict and is really just my subjective opinion.

No.14 & 15 are made up of some 3-way & 4-way intersections I had, & are there to illustrate why we don't see these things in real life.

Thanks:
To all the intersection creators, credit & links to their creations above.
I used this map https://steamcommunity.com/workshop/filedetails/?id=1113152270 as a starting point for my intersection testing map:

Видео Traffic flow on 15 Different 8-way Intersections (and alternatives) Measured, Ranked and Compared. канала RichAntDav