Before you can design a bridge, you have to graduate with a four year degree in Civil Engineering. Then you have to pass the Engineer In Training (EIT) exam, then work for four years in the industry (helping with, but never actually able to sign off on, designs), then pass the Professional Engineer (PE) exam specific to the discipline you now have 4 years experience with.
Then you get to design your first bridge and put your stamp and signature on the plans.
So, with that knowledge, how exactly does civil engineering have problems with untrained entry level people signing off on designs for bridges that readers here are likely to drive over?