Bomb shelter and Safety zone

Bomb shelter noun - A chamber (often underground) reinforced against bombing and provided with food and living facilities; used during air raids.

Safety zone and bomb shelter are semantically related. in bombproof shelter topic. In some cases you can use "Safety zone" instead a noun phrase "Bomb shelter".

Safety zone noun - A curbed area in a roadway from which traffic is excluded; provides safe area for pedestrians.

Bomb shelter and safety zone are semantically related. Sometimes you can replace phrase "Bomb shelter" with "Safety zone", this phrases are similar.