Sec. 3. All manuals (including revisions to the manuals) described in section 2 of this chapter may be considered to become a part of the Indiana Manual on Uniform Traffic Control Devices for Streets and Highways if the following conditions exist:
(1) The Indiana department of transportation concurs in the revisions.
(2) The Indiana department of transportation adopts the manuals (including revisions) by order of the commissioner of the Indiana department of transportation.