State-of-the-art sensor technology to be trialled in Sydney will scan trucks in real time and use connected warning signage to divert drivers of overheight vehicles from their routes before causing traffic headaches for motorists.

The trial is part of the NSW Government’s ongoing crusade to reduce disruption from overheight incidents that has seen tunnel closure minutes in the Sydney Harbour Tunnel cut by 80 per cent.

The automatic system will give drivers an accurate real-time height reading on their vehicle, giving heavy vehicle drivers time to change their route to avoid dangerous tunnel incidents that can cause system wide disruptions to Sydney’s road network and damage to critical infrastructure.

source: NSW Government.

This is what happens when a overheight truck enters a tunnel