Ключевые слова: accessibility, alert, barrier, blank, cellular, communication, control, copy space, crime, criminal, danger, device, digital, do not cross, electronic, emergency, empty, equipment, forbidden, guard band, illegal, law, mobile phone, mobility, mock up, modern, phone, police, portable, problem, security tape, smart phone, space, stop, striped, tablet, tape, technology, telephone, under construction, urgency, using, violence, warning, yellow,