3
votes
3answers
141 views

Is it a good idea to set a different signal for performing a u-turn?

For a long time, I wondered why is there not a separate indication to signify a u-turn, e.g. the rear lights would have would have two segments for flickering lights - one spaced on top of the other - ...
2
votes
1answer
284 views

Why are switches with light indicator common but outlets are not?

Wall mount light switches that have a neat light indicator that turns on when the switch is in "off" position are quite common. The purpose is to make finding the switch in the dark easier. Looks ...
27
votes
10answers
2k views

Traffic lights: “yellow” is progress, not state

When thinking about how (real-world) traffic lights work, I wonder if there is a more intuitive way to display the yellow light. The meaning of Green and Red are states: Green: Ok, you can go! Red: ...