oncoming traffic or slamming into each other on the sidewalk, officials in Seoul one of the world's most wired cities have begun installing the first batch of 30o warning signs this week in five locations across the capital. "We picked locations with the highest number of young pedestrians since the majority of smartphone users are in their teens to their 30s, says Kim Ooc-Kyeong, a Seoul city official in charge of the project. Some signs are attached to traffic light poles and depict a person look- ing at his smartphone as he is about to be hit by a car. But given that the target audience people who wouldn't loo their screens to see such warnings other signs have been plastered on the actual sidewalk.