India, Aug. 3 -- Every day, millions of Indians travel by road, and during the commute, you will most likely see a truck with 'Horn OK Please' painted on the back in colourful shades. But did you know that the phrase wasn't a mere decorative whim of Indian truck drivers?

On May 28, an influencer couple, Rajat and Isha, who go by 'chartered couple' on Instagram, shared a video explaining why trucks in India write 'Horn OK Please' on the back of the truck.

According to them, the phrase originated as a serious cautionary indication during World War II. Kerosene-fueled trucks were used at the time to move troops, and they were highly unstable; kerosene would cause the trucks to explode at the slightest accident. Hence, 'Horn Please. On Kero...