Where are Arizona's detention center signs

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After three inmates escaped from a private prison near Kingman and hijacked two truckers along I-40, one woman began wondering if those truckers or other motorists knew there was a prison not far off the interstate.

Signs used to dot Arizona freeways near correctional institutions. But you won't see those signs any longer, not along I-17 where there is both a federal and juvenile corrections center just north of town, And not along I-10 west of Phoenix.