Critical of the health and safety culture within British Rail at the time, Hidden recommended that unused signal wires needed to be cut back and insulated, and that a testing plan be in place, with the inspection and testing being done by an independent person. Signal technicians needed to attend refresher courses every five years, and testers needed to be trained and certified. Management was to ensure that no one was working high levels of overtime, and a senior project manager made responsible for all aspects of the project. Unprotected wrong side signal failures – where the failure permitted a train to go beyond where it was permitted – had to be reported to the Railway Inspectorate. Cab radios, linking driver and signalman, were recommended and to begin installing public address system on existing trains that were not expected to be withdrawn within five years.