If I am wrong then prove it. This is the statement which I have heard a few times already and a cursory search for "unions blocking better road repair technology" in ddg yields these articles which bolsters my argument:
Directly related: https://www.aei.org/economics/america-in-the-slow-lane-how-u...
Tangentially related:
https://uniontrack.com/blog/unions-and-automation
https://www.illinoispolicy.org/union-workers-more-likely-to-...
I can tell you what is the difference between unions in Europe and unions in the US. As far as I can tell, unions and paying fair wages are not blamed for lack of innovation in Europe. We do have a lot of news about the fight over wages, but for some reason this antagonist union bashing in the media and general population seems to still be an American phenomenon.
but unlike some american unions they do not hold the companies hostage. union shops do not exist. they can not demand that every employee joins the union. they do not control what tasks individual employees are allowed to do. they negotiate contracts and work conditions. that's all.
at least in germany unions are also favoring reduction of work hours, which is another way workers can benefit from automation without losing their jobs.