Tel Aviv, Israel, apparently had a bit of a problem with people on their phones walking into traffic. So, to combat the phenomenon, they began installing LED lights on the bottom of sidewalks. The lights switch colors depending on if it's safe to walk across the road or not. The lights will also start flashing if the road is about to open back up to vehicles, just like a normal pedestrian light would.
The lights were only installed in 2019, and we couldn't find any hard numbers as to how much, if any, accidents have declined, but we're sure that they have at least helped one person avoid being hit.