When I do that, I get two (very similar but not identical) responses side-by-side in one image (I guess as if the model is battling itself?). Is that normal for lmarena?

https://imgur.com/a/h0ncCFN

Wow, that top image is actually quite good! Interestingly, I just got into Pro and got a worse result than yours. https://imgur.com/a/ENNk68B ... and it really seems to just vary by attempt even with the exact same prompt.

Imagen4 did no better. edit: example https://imgur.com/Dl8PWgm with a so-so result: four lanes, cars at least facing the same way, lane block looks good, weird extra division in the center, some numbers repeated, one arrow going straight into construction, one arrow going backwards

edit: or Imagen4 Ultra. https://imgur.com/a/xr2ElXj cars facing opposite directions within a lane, 2-way (4 lanes total), double-ended arrows, confused disaster. pretty though.

Ooh, I just got offered the new version on https://gemini.google.com/. Plugged in that exact prompt, got this:

https://imgur.com/a/ENNk68B

Much better than previous attempts. Still has an extra lane with the cars on the right cutting off the cars in the middle. Still has the numbers in the wrong order.