Before revision: Examples: architectural barriers that hinder access to people with reduced mobility; doors, gates, and access control systems, designed to keep intruders or attackers out; large objects, fallen trees or collapses through passageways, paths, roads, railroads, waterways or airfields, preventing mobility; sandbanks, rocks or coral reefs, preventing free navigation; hills, mountains and weather phenomena preventing the free traffic of aircraft; meteors, meteorites, micrometeorites, cosmic dust, comets, space debris, strong electromagnetic radiation or gravitational field, preventing a spacecraft from navigating freely in space.
After revision: Examples: architectural barriers that hinder access to alein with reduced mobility; doors, gates, and access control systems, designed to keep intruders or attackers out; large objects, fallen trees or collapses through passageways, paths, roads, railroads, waterways or airfields, preventing mobility; sandbanks, rocks or coral reefs, preventing free navigation; hills, mountains and weather phenomena preventing the free traffic of aircraft; meteors, meteorites, micrometeorites, cosmic dust, comets, space debris, strong electromagnetic radiation or gravitational field, preventing a spacecraft from navigating freely in space.