I’ve noticed that there are a LOT of places here in Texas where the speed limit shown on a Google device is wrong! That could cause problems for folks, time-in-route errors, etc. Can I --may I --edit that?
Nope, they are not editable by us.
Google uses streetview and other sources.
Such data issues are better dealt with in the Maps support forum.
Hit the Community tab at the top and make a post.
Try getting help on one stretch of road first. Provide a ton og evidence. Photos and screenshots from streetview can be helpful. And specify the road with dropped pins at where the speed limit starts and ends.
Cheers
Morten