| (a) Each message on an electronic sign must be displayed
for at least eight seconds. A change of message must be accomplished
within two seconds and must occur simultaneously on the entire sign
face.
(b) An electronic sign must:
(1) contain a default mechanism that freezes the sign
in one position if a malfunction occurs; and
(2) automatically adjust the intensity of its display
according to natural ambient light conditions.
(c) The owner of an electronic sign shall coordinate
with state and local authorities to display, when appropriate, emergency
information important to the traveling public, such as Amber Alerts
or alerts concerning terrorist attacks or natural disasters. Emergency
information messages must remain in the advertising rotation according
to the protocols of the agency that issues the information.
(d) The department will share the contact information
required by §21.154(e) of this subchapter (relating to Permit
Application) with the appropriate local authority that has jurisdiction
over the location of the electronic sign.
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