The provisions of this act¹ shall not preclude any person in need of any highway remediation or cleanup service from employing or contracting with any licensed highway remediation service of choice, except where hazardous conditions exist which pose an imminent threat to human health or the environment, in which case a law enforcement officer may contact any available highway remediation and cleanup service operator or any other provider of a needed service as the officer deems necessary as safety and time conditions warrant.