In the event of a public emergency, such as extreme weather, hazardous traffic conditions, natural disasters, attacks by terrorists, amber alerts, emergency evacuations, public infrastructure failures, massive traffic accidents or a blockade of traffic, the digital billboard shall, upon directive from the Township, continuously display a public emergency message as communicated by Township, state or federal officials. The time for the public emergency message shall be a minimum period of two hours or until such time as the public emergency message is no longer deemed necessary as determined by the Township, whichever period shall be shorter. Such messages shall preempt paying advertisers. The Township shall develop, adopt, and communicate to the owner a written protocol concerning the display of such public emergency messages in order to ensure that the messages are communicated as quickly as possible and for the duration necessary.