You are correct this is a typo on my part. I have fixed it properly to culvert

I believe you are correct. "Pitch"+"equestrian" makes more sense than "horse_riding". I have adjusted it. Thanks for pointing this out.

Source of changes was a site survey not bing.

Duplicate upload of area. Fixed in changeset/37070734

Fixing duplicate upload in changes 37070622.

Clouds cover parts of the Bing images which is why the road is broken up.