The Delhi Metro Rail Corporation (DMRC) has implemented extensive safety measures across Phase-4 construction sites, installing nearly 20 kilometres of barricading, LED rope lights and blinkers to protect motorists and pedestrians amid large-scale construction activity. To improve visibility during winter nights and foggy conditions, around 17 kilometres of LED rope lights and blinkers have been fitted along barricades, making construction zones easier to identify. DMRC said these measures aim to minimise risks and ensure safer movement around work sites. More than 270 traffic marshals have been deployed to manage vehicular flow and ensure safety near construction zones round the clock. Trained by traffic experts, the marshals assist in coordinating the movement of heavy machinery and cranes, particularly during night-time operations. DMRC has also installed road studs to slow down vehicles near vulnerable points, along with adequate warning signage indicating diversions and ongoing work. As part of Phase-4 implementation, dedicated impact protection vehicles have been introduced to safeguard workers and road users during the movement and placement of heavy equipment. These vehicles are designed to withstand collisions from speeding vehicles. Additional safety measures have been adopted to counter reduced visibility during winter fog, including fog lights on barricades, reflective tapes on workers’ helmets and high-visibility jackets. Where diversions are required, DMRC said detailed planning is undertaken in coordination with the Delhi Traffic Police, supported by a three-layer safety system comprising plastic barriers, sand- or water-filled drums and concrete crash barriers. The barricades are designed to be bottom-heavy and anchored to the ground to prevent toppling during strong winds or heavy rain, with individual units secured using nuts and bolts. Concrete crash barriers are also deployed as hard barricading to protect vehicles from colliding with heavy machinery within construction zones. These barriers are manufactured using recycled construction waste and reinforced with additional protective layers. To ensure uniform safety standards, DMRC has incorporated detailed traffic management guidelines in its tender documents, making compliance mandatory for contractors. These norms are based on previous project experience and Indian Road Congress guidelines. Despite the challenges of executing mass transit projects in densely populated urban areas, DMRC said vehicular and pedestrian movement around Phase-4 sites has remained largely incident-free, reflecting the effectiveness of the enhanced safety framework.