 An EU directive passed in 2004 laid down the minimum safety requirements for road tunnels within the EU and EFTA that exceed 500 m in length and that are part of the Trans-European Road Network (TEN).Although the Hindhead tunnel is more than 500 m in length, it does not carry part of the TEN road network so legally does not need to comply with the directive.The tunnel approaches have cross-over systems that enable the police to direct all traffic through one of the tunnels should the other be closed as a result of an incident or for maintenance.