The shutdown disrupted vehicular traffic along the highway from early Friday morning.
The unions are protesting the manhandling of the drivers of vehicles (Me 1 Ja 818, 639 and 562) on Wednesday evening by a group that identified itself as ´Limbuwan´.
The same group also attacked Ganesh Aryal, a journalist, who had reached there to cover the incident.
Kesang Lama, vice-chairman of Nepal Transport Workers´ Association, Ilam chapter, said the shutdown had to be enforced after the administration failed to book assailants even after repeated cases of manhandling of transport workers.
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