yes,...a city or whoever has a responsibility to hire the best employee to fill any position - that employee, including engineers, have the responsibility for doing their correct, best work (and keeping their license current), the contractors have a responsibility to do the work properly and as contracted, motorists have the responsibility to use the roads lawfully and safely..as do bikers and pedestrians.  of course that is in a perfect world, but it doesn't take much effort, or common sense, to look after ourselves better.  nobody is going to cover your butt as well as you can yourself because nobody has as much to lose.  and of course , doing the best that can be done, stuff happens.  amazing instances of wrong place, wrong time tragedies. and instances of amazing indifference.