The phrase 'Horn OK Please' seen on Indian trucks has origins either as a safety measure during a diesel shortage or a marketing strategy by TATA. It advised drivers to honk while overtaking. Today, it remains a cultural symbol on Indian highways despite advancements in truck safety features and mirrors.The phrase 'Horn OK Please' seen on Indian trucks has origins either as a safety measure during a diesel shortage or a marketing strategy by TATA. It advised drivers to honk while overtaking. Today, it remains a cultural symbol on Indian highways despite advancements in truck safety features and mirrors.