Stone age technology is still good technology if it does the job well. In the USA / Canada, people seem to get angered / offended when someone honks at them, and similarly people often honk out of anger.

Having phone numbers on license plates comes to mind... so you can call people and tell them to get out of the way =)

Things work slightly differently in India: most of the time you tap lightly to tell people that you're bigger, faster, and approaching from behind, and that it is safer for them to change lanes and let you pass =)