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Interestingly enough, the Fukushima exclusion zone has roads that pretty much fit the bill. They're the pink lines on this map (PDF), with the exclusion zone in gray:

https://www.meti.go.jp/english/earthquake/nuclear/roadmap/pd...

You are permitted to drive through but not stop or get out of your car. I presume ordinary speed limits apply though, so no exciting post-apocalyptic signage.

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That's likely because alpha and beta emitters are trivially blocked by common car materials, but getting your skin covered in them or inhaling them does much more damage (this is actually what killed a lot of Chernobyl firefighters: they wore their dust covered coats for hours, and died of sepsis from extensive beta burns. Had they been decontaminated quickly, they would've survived).

I’m not 100% convinced by that as motorcycles are also permitted in some cases?

It's more the dust issue. Like, someone on a motorcycle who doesn't stop isn't going to pick up an appreciable amount from the road way. But if you pull over, get out, stroll around in the dirt in your boots etc.?

As you'd find if you drove a motorcycle fast enough in the rain, a motorcycle with a fairing and windshield will sweep the rain (or dust) over and past you and you only get wet when you stop at a light. Perhaps that's the case here as well.

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