[xuhu]

Why don't they just transport the blades standing up ?

[azurezyq]

This is actually the current practice: https://www.windpowermonthly.com/article/1371626/gallery-bla...

[gmueckl]

On the ground? Well, you're welcome to count the number of overpasses you'd have to clear or circumvent somehow.

[noselasd]

They tip over from inertia or a small wind gust.

[lexicality]

too dangerous - they might get struck by lightning