To ensure maximum passenger safety, cruise ship railings are governed by strict international maritime standards, specifically those set by the International Convention for the Safety of Life at Sea (SOLAS). The minimum required height for outdoor deck railings (guardrails) is typically 1.1 meters (approx. 43.3 inches or 3.6 feet). This height is calculated to be well above the average person's center of gravity, making it physically difficult for a passenger to "accidentally" fall overboard during normal ship movements. Many modern cruise lines, including Royal Caribbean and Carnival, often exceed this minimum, installing glass or metal barriers that are 45 to 48 inches high, particularly on balcony railings and upper sun decks. Additionally, these railings are designed without horizontal "climbing" rungs to prevent children from scaling them. While the railings are high enough to be safe, they are usually topped with a wide teak or metal rail and often utilize transparent glass panels to ensure that the height doesn't obstruct the scenic ocean views for guests.