I'd have thought rights of way, but I think right of ways is also a thing - they have slightly different meanings iirc.
[eta]ah, according to wiktionary, right of ways does get used in specific circumstances, but is generally considered an error:
Quote:
The plural "rights of way" can be used for all senses. The alternative plural "right of ways" is generally used only when referring to an easement or a physical stretch of land, and may be regarded as an error.
Read more at http://www.yourdictionary.com/right-...L5rPaK0GJhF.99
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It make sense, since the thing being categorised is the right not the way ('of way' is a description of the right).