Indiana Code Title 9. Motor Vehicles § 9-21-4-3

Sec. 3.  (a) As used in this section, “traffic calming device” means a device erected to slow traffic on residential streets, including the following:

(b) A local authority shall place and maintain traffic control devices upon highways under the authority's jurisdiction, not including state highways, the authority considers necessary to indicate and to carry out this article or local traffic ordinances or to regulate, warn, or guide traffic.  All traffic control devices, except traffic calming devices, erected under this section after June 30, 1939, must conform to the Indiana manual on uniform traffic control devices for streets and highways, (“the state manual”) and design specifications.  However, the design and use of traffic calming devices shall conform to generally accepted engineering principles of road design, and shall not affect the requirements of the state manual and design specifications as regards any other traffic control device, as used in this chapter.