(b) New restrictions. Except as noted in § § 212.109 and 212.117 (relating to bridge speed limits; and weight, size and load restrictions), engineering and traffic studies can be performed by police officers, roadmasters, maintenance supervisors or traffic technicians. The establishment or revision of a traffic restriction may be warranted if one of the following applies:

1. (1) One or more of the engineering and traffic study warrants covered in this chapter justifies the traffic restriction.
2. (2) Sound engineering judgment based upon a combination of all data sources substantiates the need for the restriction.

(c) Removal of an existing restriction. The removal of an existing traffic restriction may be warranted if one of the following applies:

1. (1) A study indicates that none of the engineering and traffic study warrants covered in this chapter justify the existing traffic restriction.
2. (2) The condition that originally justified the restriction no longer exists.

(g) Highway occupancy permits and utility work.

1. (1) The standards in this chapter are applicable to all utility work and work performed under a highway occupancy permit, except that work performed under a highway occupancy permit or utility work requiring a permit, with the permit issued before January 1, 2006, must comply with the standards applicable at the time the permit was issued. Those standards may be found in Department Publications 68, Official Traffic Control Devices, 1975 Edition, 201M, Engineering and Traffic Studies, dated December 1993, and 203M, Work Zone Traffic Control, dated September 24, 2002.
2. (2) The standards in this chapter apply to all utility work performed on or after January 1, 2006, using an emergency permit card under § 459.6 (relating to emergency work).