India, Dec. 10 -- Amid rising smog and poor visibility on expressways, the National Highway Authority of India (NHAI) have begun displaying warnings and instructions for safe commutation on high-speed corridors through electronic billboards, said NHAI officials on Tuesday.

According to NHAI officials, highway patrol vehicles equipped with red/green blinking batons and public address (PA) broadcast systems displaying speed warnings, lane guidance and fog-safety instructions, along with cranes, are being deployed on dense foggy patches of Delhi-Gurugram-Jaipur (NH 48), Dwarka Expressway and Sohna Elevated Road to guide traffic and prevent accidents.

NHAI officials said such electronic warnings and measures against fog are part of the annu...