70% of noise pollution on Mumbai’s roads is due to excessive honking. After many attempts to curb it, Mumbai Police did what fines couldn’t – they changed behaviour with an unexpected dash of humour by turning traffic signals into Punishing Signals. When honking crossed 85 dB, the countdown timer at a signal would reset, making impatient motorists wait more. A film of this solution was cut and tweeted by Mumbai Police. It soon became the most liked and shared topic in India, creating instant results as well as nationwide chatter.