Freestanding interstate signs shall be allowed only upon approval by the planning commission of a conditional use permit or a planned sign program and shall be subject to the following:
A. A freestanding interstate sign may be allowed for commercial, industrial, or mixed-use sign-premises that are:
1. A minimum of one acre in size,
2. Within 250 feet of the interstate right-of-way or within 250 feet of the railroad right-of-way, and
3. Within 250 feet of the right-of-way of an arterial roadway intersecting the interstate.
B. A freestanding interstate sign shall not exceed a height of 65 feet above the finished grade beneath the sign, exclusive of any filling, berming, mounding or landscaping done solely for the purpose of locating the sign.
C. A freestanding interstate sign shall not exceed an area of 300 square feet.
D. A freestanding interstate sign shall not be located within 500 feet of another freestanding interstate sign.
E. A freestanding interstate sign shall be a minimum of 500 feet from the property line of any existing residential use.
F. A freestanding interstate sign may include an electronic message display component subject to section 17-10-19 (electronic message displays).