Echo is another intersection based on the cross parallel buffer which is a bit squashed but retains its mirror symmetry.
Edit: I modified Echo so that set 3 now synchronizes. The stat line is now significantly better than the cross parallel buffer.
I've also just added the Echo 1.1 3 Way! It ...

I found that during set 2, only one set of lanes would be utilized, reducing overall throughput. There isn't enough space to modify track lengths so I put a circuit network connection on the signals that only allows trains from a direction to go if they have the same or more buffered trains than the ...

After more adjustments, I present Hurricane 1.1.

6 car trains, 150x150, 2 lane, 6 tile spacing

Score 108

RHD
S1: 107, 107, 108
S2: 106, 106, 106
S3: 111, 111, 111

LHD
S1: 109
S2: 105
S3: 110

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Starfish v1.2
Edits were made so that set 3 now alternates properly. Signals were reduced for ups concerns.

Score 94

RHD
S1: 104
S2: 91
S3: 87

LHD
S1: 103
S2: 92
S3: 89

6 car trains, 150x150, 2 lane, 6 tile spacing

0eNqsvUuvnVdypP1XCI5VhXW/aObLwIMPjYbds65GQ1axXETLlEBJBRcM ...

I made a parallel buffered version of the cross intersection!
Cross Parallel Buffer
Score 82

RHD
Set 1: 100, 97
Set 2: 80, 81
Set 3: 68, 68

LHD
Set 1: 99
Set 2: 79
Set 3: 68

6 car trains, 174x174, 2 lane, 6 tile spacing

0eNqtnU2PJcdxtf9KY9aUUPmdyZ0pL7zwQrCXrwxjSLXkgUdDYmZIWDD039 ...