He approaches a railway bridge. There are no bridge warning signs. What does this tell him about the bridge height?

Question Topic: LGV CPC Case Study

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the headroom is at least 12ft (3.6m)
the headroom is at least 16ft 6ins (5.0m)
the headroom is at least 15ft (4.5m)
the headroom is at least 14ft (4.2m)

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