Absolutely. I would suggest that cars have two other standardised lights in addition to turn signals:<p>a) Brake light on the front of the car<p>So that when you turn across traffic on a yellow light you can see that the oncoming car is braking.<p>b) Thank-you light on the back of a car. Maybe blue.<p>We can already express displeasure, but wouldn&#x27;t it be nice to express pleasure with other road users.