Why are there barriers on one side of the road, why does half the crosswalk have a red light while the other half has a green light?

what, have you never seen a construction on the road? have you never seen a traffic light, that is manually activated?

both of these scenarios are happening on a daily basis in real life.

and they are here so you can think about the decision. is the car occupant’s life more valuable than the life of innocent bystander (eh, is bywalker a word)? does that change when one group is bigger in numbers? does it change when one group is obeying law and the other one not?

i have answered basically same question here: https://lemm.ee/post/36643403/13142015