On the other hand, some examples of what not to do from my country:

* Concrete Bollards on road shoulders that cause cars to roll over:

https://historico.elsalvador.com/historico/678007/vuelca-veh...

* Trees on road medians that cause accidents every one or two weeks as far as I remember

https://www.elsalvador.com/noticias/nacional/accidentes-vict...

* Killer unannounced speed bumps

http://diario1.com/nacionales/motociclista-muere-tras-ser-at...

News coverage/press releases mostly say that accidents were caused by “excessive speed” and then life goes on.