If anyone is found doing so, action should be initiated against them, he said.
Singh said nobody should be allowed to stop any private bus from operating.
"Additional police personnel have been deputed in sensitive such areas as Jind and Rohtak, and SPs in other districts have been directed to depute home guards, if required," he told reporters here.
Replying to a question, the DGP said that according to the reports received so far, the strike had been peaceful and there was no report of any untoward incident or any coercion.
As the strike continued for the third day, public transport buses remained off road, inconveniencing commuters across the state.
The Haryana roadways employees are protesting over issuance of permits to private operators.
Over 13 lakh passengers travel in the state roadways buses daily and about 4,000 buses, which include the luxury Volvo bus service, have come to a halt in the state since Monday evening.
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