It won't increase their visibility, obviously. It will make them think twice before going on that crosswalk. Maybe they'll wait for a car that slows down after they've taken only 1 step on the crosswalk, maybe they'll wait for their eyes to meet the driver's or to see the driver making a "go, go" sign with their hand.

Governments should make roads safer but until they do, we should care for ourselves.

Imagine a sidewalk where the ground is crooked, full of holes and parts of the pavement sticking up. Should we blindly go on the sidewalk saying "the government should make it better" or should we exercise caution not to trip and fall?

The same logic applies to most dangerous things. Should the government make sure the food and supplements that are imported is safe? Of course. Does that mean you should order food and supplements from any shady site from a random 3rd world country with no reviews? Absolutely not.