Any person wishing to transport high explosives in the municipality shall first acquire a permit from the Board of Trustees and shall take such precautions and use such route as they may prescribe. Nothing herein shall be construed to apply to the county police, or any of the Armed Services of the United States. No vehicle transporting explosives shall make an unscheduled stop for longer than five minutes within the municipality and in the event of mechanical failure, immediate notice of such breakdown shall be given the County Sheriff, who shall then prescribe such precautions as may be necessary to protect the residents of the municipality and a reasonable time for removal of the vehicle from the municipality.