This was a proposed new traffic light design by Thanva Tivawong. The concept was based on a traditional hourglass. LED lamps were used to show the movement of sand trickling down from the top compartment to the lower compartment. It was a straightforward design, which had an obvious message that the sand indicates how much time they have left.
I like the design because it is sensible and communicative. It also looks better than the common boring circle traffic lights. However, I think there might be a problem for people suffering from color blindness. I am also not sure whether this design is actually better in terms of function compared to the traffic lights with numeric countdowns.
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