2014 Tennessee Code
Title 54 - Highways, Bridges And Ferries
Chapter 21 - Billboard Regulation and Control Act of 1972
§ 54-21-122 - Changeable message signs.

(a) Changeable message signs may be double faced, back to back or V- type signs.

(b) Changeable message signs with a digital display that meet all other requirements pursuant to this chapter are permissible subject to the following restrictions:

(1) The message display time shall remain static for a minimum of eight (8) seconds with a maximum change time of two (2) seconds;

(2) Video, continuous scrolling messages and animation are prohibited; and

(3) The minimum spacing of the changeable message signs with a digital display on the interstate system or controlled access highways is two thousand feet (2,000'); provided, however, that an outdoor advertising device that uses only a small digital display, not to exceed one hundred square feet (100 sq. ft.) in total area, to give public information, such as time, date, temperature or weather, or to provide the price of a product, the amount of a lottery prize or similar numerical information supplementing the content of a message otherwise displayed on the sign face shall not be subject to the minimum spacing requirement established in this subdivision (b)(3), or to any application for a specific digital display permit or permit addendum as established in subsections (c) and (d), or to any fee for a permit addendum as established in § 54-21-104(b).

(c) No person shall erect, operate, use or maintain a changeable message sign with a digital display in a new location without first obtaining a permit and tag expressly authorizing a changeable message sign with a digital display, and annually renewing the permit and tag, as provided in § 54-21-104. No outdoor advertising device with a digital display lawfully permitted, erected and in operation prior to June 1, 2008, shall be required to obtain any additional permit under this subsection (c).

(d) No person shall erect, operate, use or maintain a changeable message sign with a digital display in place of or as an addition to any existing permitted outdoor advertising device without first obtaining, and annually renewing with the permit, an addendum to the permit expressly authorizing a changeable message sign with a digital display in that location. No outdoor advertising device with a digital display lawfully permitted, erected and in operation prior to June 1, 2008, shall be required to obtain any addendum under this subsection (d).

(e) The commissioner shall under no circumstances permit or authorize any person to erect, operate, use or maintain a changeable message sign of any type as a replacement for or as an addition to any nonconforming outdoor advertising device or in any nonconforming location.

(f) Notwithstanding any other state law or regulation to the contrary, a person who is granted a permit or an addendum to a permit authorizing a changeable message sign with a digital display in accordance with subsection (c) or (d) shall have up to, but no more than, one hundred eighty (180) calendar days after the date on which the permit or addendum is granted within which to erect and begin displaying an outdoor advertising message on the changeable message sign. If the permitted or authorized changeable message sign with a digital display is not erected and displaying a message within this required time, the permit or addendum to the permit shall be revoked and the changeable message sign with the digital display shall be removed by the applicant or subject to removal by the commissioner as provided in § 54-21-105.

(g) Any application for a permit or addendum for a digital display as described in this section may be made using the form for an application for permit for an outdoor advertising device existing on June 1, 2008, until a separate form is available.

(h) (1) All changeable message signs installed on or after July 1, 2014, shall come equipped with a light sensing device that automatically adjusts the brightness in direct correlation with ambient light conditions.

(2) The brightness of light emitted from a changeable message sign shall not exceed 0.3 foot candles over ambient light levels measured at a distance of one hundred fifty feet (150') for those sign faces less than or equal to three hundred square feet (300 sq. ft.), measured at a distance of two hundred feet (200') for those sign faces greater than three hundred square feet (300 sq. ft.) but less than or equal to three hundred eighty-five square feet (385 sq. ft.), measured at a distance of two hundred fifty feet (250') for those sign faces greater than three hundred eighty-five square feet (385 sq. ft.) and less than or equal to six hundred eighty square feet (680 sq. ft.), measured at a distance of three hundred fifty feet (350') for those sign faces greater than six hundred eighty square feet (680 sq. ft.), or subject to the measuring criteria in the applicable table set forth in subdivision (h)(4).

(3) Any measurements required pursuant to this subsection (h) shall be taken from a point within the highway right-of-way at a safe distance from the edge of the traveled way, at a height above the roadway that approximates a motorist's line of sight, and as close to perpendicular to the face of the changeable message sign as practical. If perpendicular measurement is not practical, valid measurements may be taken at an angle up to forty-five degrees (45 degrees) from the center point of the sign face. If measurement shows a level above that prescribed in subdivision (h)(4), the exact calculations shall be provided to the sign permit holder.

(4) In the event it is found not to be practical to measure a changeable message sign at the distances prescribed in subdivision (h)(2) a measurer may opt to measure the sign at any of the alternative measuring distances described in the applicable table set forth in this subdivision (h)(4). In the event the sign measurer chooses to measure the sign using an alternative measuring distance, the prescribed foot candle level above ambient light shall not exceed the prescribed level, to be determined based on the alternative measuring distances set forth in the tables in subdivisions (h)(4)(A), (B), (C), and (D), as applicable. For any measuring distance between the alternative measuring distances set forth in the following tables, the prescribed foot candle level above ambient light shall not exceed the interpolated level derived from the following formula: Click here to view image. Where I1 = the prescribed foot candle level above ambient light for the measuring distance listed in the tables, I2 = the derived foot candle level above ambient light for the desired measuring distance, D1 = the desired measuring distance in feet, and D2 = the alternative measuring distance in feet listed in the tables, as follows:

(A) For changeable message signs less than or equal to three hundred square feet (300 sq. ft.): Click here to view image.

(B) For changeable message signs greater than three hundred square feet (300 sq. ft.) but less than or equal to three hundred eighty-five square feet (385 sq. ft.): Click here to view image.

(C) For changeable message signs greater than three hundred eighty-five square feet (385 sq. ft.) but less than or equal to six hundred eighty square feet (680 sq. ft.): Click here to view image.

(D) For changeable message signs greater than six hundred eighty square feet (680 sq. ft.): Click here to view image.

(5) This subsection (h) shall apply to all changeable message signs located in this state operated pursuant to a permit issued by the commissioner.