[LordOddsocks]

“Roundabouts are also better for the environment. You never come to a complete stop, Brainard points out”

I saw this traffic modelling video the other day about a humble cross roads which becomes a grade-separated clover-leaf or some such.

https://www.youtube.com/watch?v=yITr127KZtQ

[ridesthemiles]

YOU ABSOLUTELY DO come to a complete stop at roundabouts here in Nevada.

[Jeff Chandler]

Sorted by traffic flow:

5:50 Stack interchange (2-lane ramps) [TF: 1099]
5:40 Contraflow left [TF: 948]
5:30 Turbine [TF: 927]
5:20 Pinavia [TF: 905]
5:10 Diverging Windmill [TF: 808]
5:00 Custom Cloverleaf [TF: 758]
3:20 Diverging diamond interchange [TF: 644]
4:20 Partial Cloverleaf (Parclo A4) [TF: 639]
4:40 Three level roundabout [TF: 623]
2:40 Continuous flow intersection [TF: 618]
4:30 Two level roundabout [TF: 598]
3:30 Single Point Urban Interchange [TF: 581]
4:10 Partial Cloverleaf (Parclo AB2) [TF: 570]
4:00 Partial Cloverleaf (Parclo B2) [TF: 570]
2:20 Custom roundabout with slip lanes [TF: 532]
3:10 Diamond interchange (with custom traffic lights and slip lanes) [TF: 529]
3:50 Large Dumbbell [TF: 528]
4:50 Standard Cloverleaf [TF: 516]
2:30 Turbo roundabout [TF: 501]
1:40 8-lane roads with slip lanes [TF: 490]
1:20 6-lane roads with slip lanes [TF: 465]
3:00 Diamond interchange (with traffic lights) [TF: 448]
2:50 Diamond interchange (no traffic lights) [TF: 448]
3:30 Dumbbell [TF: 443]
1:30 6-lane roads plus slip lanes [TF: 432]
1:00 6-lane roads with custom traffic lights [TF: 417]
1:10 6-lane roads with protected left turns [TF: 416]
2:10 Large roundabout [TF: 360]
2:00 standard roundabout with highway road [TF: 340]
0:30 4-lane roads plus dedicated left turn lane [TF: 320]
0:20 4-lane roads with custom traffic lights [TF: 303]
0:50 6-lane roads with traffic lights [TF: 251]
0:10 4-lane roads with traffic lights [TF: 235]
0:40 6-lane roads without traffic lights [TF: 205]
0:03 4-lane roads without traffic lights [TF: 191]
1:50 Standard roundabout (no mods) [TF:8]???

[zeugma]

That modeling vid was cool. Some of the designs looked really confusing. Also noticed that in some of the examples, an ambulance passed right through several vehicles. :-)