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<p>I think some passages are called a mole pipe, but that makes it not a tunnel.</p>
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<p>Don't have tunnel vision: All your examples are railroad bridges.</p>
<p>A tunnel has mosttimes also a depth: it lies not under, but beneath something and/or crosses several things.</p>
<p>Also, sometimes a traffic sign F8 can be found near the entrence.</p>
<p>Regards,</p>
<p>Gerard</p>
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<p>OSMDoudou schreef op 2019-05-27 21:32:</p>
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<div dir="ltr">If it can help, Wikipedia cites criteria like twice as long as wide and "creating a confined area".</div>
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<div dir="ltr"><a href="https://en.m.wikipedia.org/wiki/Tunnel" target="_blank" rel="noopener noreferrer">https://en.m.wikipedia.org/wiki/Tunnel</a></div>
<div dir="ltr"><a href="https://fr.m.wikipedia.org/wiki/Tunnel" target="_blank" rel="noopener noreferrer">https://fr.m.wikipedia.org/wiki/Tunnel</a></div>
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