The World Road Association (PIARC) has recently released a Report titled ‘Improving safety in road tunnels through real-time communication with users‘. This report is a continuation of the one published by PIARC in 2008 on ‘Human Factors and road tunnel safety regarding users‘. It describes human behavioural aspects when driving, andhow to communicate information to tunnel users in normal, congested and critical situations. It details the various systems that can be activated for real-time communication with users and reviews how these devices can be used in cases of congestion, a serious incident and fire and how the activation of these systems and devices must be adapted to the changing circumstances of the event.