Ajit Borthakur, J.

1. Heard Mr. P.K. Tiwari, learned Sr. Counsel, Mr. P. Taffo, Mr. M. Kato, Mr. A. Sarma, Mr. M.E. Nagesh, Ms. N. Danggen, Mr. B. Pandey, Mr. N. Ratan learned counsels, respectively for the petitioners. Also heard Mr. S. Tapin, learned Sr. Govt. Advocate assisted by Mr. D. Soki, learned Addl. Sr. Govt. Advocate appearing for the State Respondents. In the above set of writ petitions, the petitioners have challenged the legality and validity of the order, vide Memo. No. TPT(B)-19/03/2017, dated 06.06.2017, issued by the respondent the Commissioner, Transport, Govt., of Arunachal Pradesh, whereby the registrations of all the tourist buses/sleeper coaches are directed to be cancelled under Section 55 of the Central Motor Vehicles Act, 1988 (for short, 'CM. V. Act, 1988') and also directed the proprietors of such vehicles to report their vehicles at the nearest Police Stations. The petitioners have also challenged the legality and validity of the consequential orders, dated 09.06.2017, issued by the respondent-the Director, Transport Cum Secretary, State Transport Authority, Arunachal Pradesh, vide Memo. No. DT/STA/11/2000-II and the District Transport Officers