India, Nov. 14 -- Haryana Roadways' Gurugram bus depot has ordered the installation of reflectors and fog lights on all its buses and made the pollution under control certificate mandatory, state transport officials said on Thursday.

The decision comes in view of the dipping visibility in Gurugram and nearby districts as winter smog starts engulfing the streets, according to officials.

Bharat Bhushan Gogia, depot's general manager, said the fleet is going through a maintenance drive at the workshop to ensure that brakes, headlights and fog lamps of all its buses are functioning properly.

"Foggy conditions make navigation at night a big challenge, especially on slippery roads. Therefore, buses must remain orderly to prevent any untoward...