Why don't traffic lights include the time until the light goes red or goes green?

by SmedleyDSlap   Last Updated June 02, 2017 02:16 AM

Whenever I am driving I try to speed through the light when it is yellow and it is always stressful trying to get through before it becomes red. Street crossing lights have a countdown number that tells the walker how long until the light changes. Why isn't a similar thing implemented on traffic lights? enter image description here

Tags : physical signs


Answers 1


Actually there are examples of this in different countries, or at least I have seen it in Shanghai before.

There are a lot of reasons behind whether systems like this can be implemented or not, but a traffic engineer might provide a more accurate answer. But in general these are the considerations that I know:

  • Cost: probably the number one consideration since these devices are quite expensive to install and maintain
  • Feasibility: traffic regulations and rules may prevent the logical or practical implementation of these systems
  • Impact: you could argue whether pedestrians just end up modifying their behaviour instead of becoming more safety conscious, and whether drivers would end up just modifying their behaviour as well.
Michael Lai
Michael Lai
June 02, 2017 01:59 AM

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