 Although the EU directive requires laybys at intervals not exceeding 1000 metres for TEN-T tunnels that do not have emergency lanes, the Hindhead tunnel does not have any laybys, but it does have 1.2 m verges on either side of the carriageway.The tunnel has two power supplies, one via the north portal and the other via the south portal, each backing the other up in the event of failure.Ventilation is provided by fans mounted above the traffic, though in normal circumstances they will not be operational.