Division 2.3.3 Emergency exits allow tunnel users to leave the tunnel without their vehicles and reach a safe place in the event of an accident or a fire and also provide access on foot to the tunnel for emergency services. Examples of such emergency exits are:X1
United Kingdom
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direct exits from the tunnel to the outside,
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cross-connections between tunnel tubes,
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exits to an emergency gallery,
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shelters with an escape route separate from the tunnel tube.