I fully understand and agree. It is really difficult. And of course the bridge warning signs are there, when looking only from that point of view you are totally right. But we all know how human civilization works. People are tired that still have to perform duties. People still jump behind the wheel. Humans have emotions, diseases. Now we got as extreme example, SARS-CoV2 with the brainfog issues. The flu causes people to have less attention. Heavy rain, heavy snowfall. A lot of uncontrollable variables can limit the view of the driver. The point is, when safety measures are needed. Might as well do them properly. Our society is pushing people beyond healthy limits which makes those bridge warning signs not sufficient , especially when looking at all those youtube videos with all the evidence that the bridge warning signs do not help.
The reason why our society is pushing people beyond healthy limits is because of greed, laziness, lack of compassion, lack of the desire to make intelligent decisions. All that jazz. It is standard and has been for millennia. The positive hard workers and the positive thinkers perform and create until they are overruled by people with fatalistic views and who only want to feel constant pleasure. Which is biologically impossible for humans at least and for almost every life form on Earth. The fatalistic people keep seeking more and more constant (artificial) pleasure which is where all our scary stories are based upon for thousands of years... Only one thing works : Work-Reward but evenly distributed among people. We are wired with a reward center for a reason...