I'm neither a qualified civil engineer nor a qualified builder. Having said that I've gained some experience over the years drawing up building plans and specifications.

Based on what I've personally seen during my short time here I've become convinced that I've witnessed the worst building/construction/roadworks etc ever in my life.
To say it's worrying would be an understatement.
The house I currently rent has the poorest build quality I've ever experienced.
I've seen major road construction that clearly hasn't had motorised traffic in mind.

You just couldn't make it up.