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It could possibly be stored mental tension arising.
It could possibly be the body adjusting; so breathing & mental energy can flow via a more optimal route.
It could be due to poor sitting posture, such as sitting cross-legged with a hunched back or forcing oneself to unnaturally sit cross-legged (but this would obviously not happen when commuting).
You should soften your awareness around the neck/throat area.
I assume you are practicing the Goenka method. While I personally do not know how the Goenka method is actually practised; you probably should stop any active body sweeping/scanning when the tension arises and simply just sit with an aim of simply relaxing the mind, face, eyes, jaw & the body.
If the neck tension remains of physical concern, consult an acupuncturist who appears competent & knowledgeable about meditation & breath ('prana; chi'). Note: there are often vast variations of knowledge & skill between acupuncturists and other complementary medicine practitioners, such as osteopaths.
Things like faulty or excessive yoga practise can also cause subtle physical abnormalities and distortions. Subtle displacemnts/distortions of hip flexor muscles, for example, from yoga or forced cross-legged sitting can affect the diaphragm & neck and block the naturally flow of subtle breathing in the throat/neck.
To summarize:
Focus on relaxation of face, jaw, eyes, mind & body and stop any active method
Consult an acupuncturist or otherwise gentle osteopath.
Be cautious towards forced crossed-legged sitting and strong yoga asana (such as 'Iyengar' & 'Pattabhi Jois Mysore Ashtanga' methods).
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Even I have undergone tightness around my neck and I have been equanimously observing it and it gradually dissolves
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Past sankhara and sanna create bizarre experiances when meditation. Don't get alarmed, just look at the sensations and keep meditating.
To rule out any sensations due to medical issue, it is also best to see a doctor when pain or tightness arise. If there is no medical issue then don't fret about it too much and do meditation as usual.