prompter: If red means to stop, yellow means to slow down, then green means to __?

assistant: Green means to go. In traffic lights, green is used to indicate that it is safe and allowed to proceed with caution. When the green light is on, it means that vehicles, pedestrians, or cyclists can move forward without stopping, provided it is safe to do so.

prompter: I have noticed that traffic lights for trains often do not have a regular traffic light and instead the red is at the bottom and there are two yellow lights and no green light instead, what is up with that?

assistant: If red means to stop, yellow means to slow down, then green would most likely mean to go or proceed. The colors red, yellow and green are mostly used in traffic lights where they are meant to prevent accidents. They will tell drivers when they are allowed to go ahead or when they must stop.

prompter: Could you come up with a creative solution that is completely different to the one you just provided?

assistant: Yes, Sure thing, here it is: 
if one looks in the circle of RGB he may notice that red and yellow are very close to each other and immediately after them comes the color green. So, if we'll look at the RGB circle as a speedometer that tells you how much to slow down, blue shall be the proceeding sign, and hence green may mean slow down but just a little. 
But of course, please notice that the creative solution I just gave you is not one you shall implement on the roads. In real life, green means proceeding on, and ignorance in this matter can cause a life danger, please obey the law.

prompter: Within your creative solution what would the colors Cyan, Violet, and Yellow represent? What would be an example of a life danger of implementing the color of Cyan on a signal at a four-way intersection where perpendicular traffic received a Violet?

prompter: 1. The explanation compares the RGB color circle to a speedometer. Can you elaborate on this analogy and how the proximity of red, yellow and green on the RGB circle relates to slowing down and speeding up? What do the other colors on the RGB circle represent in this analogy?

2. The explanation states that green means "slow down but just a little". However, it then acknowledges that in actual traffic lights, green means "proceeding on". Why the inconsistency? Is the RGB color circle analogy flawed or limited in some way? How can it be improved?

3. The explanation ends by emphasizing that one should obey actual traffic laws and not the creative analogy given. Why is it important to clarify this? What could be the consequences of someone misinterpreting the analogy and applying it to actual driving? How can such misinterpretations be avoided when giving such analogies or creative explanations?

4. Is there any other way to explain the proximity of red, yellow and green on the RGB color circle? What is the significance of these three primary colors being placed close together? What other analogies or explanations might be used?

assistant: Use only green and red. with this solution you save 33% of bulbs, you save on the complexity of the traffic lights, their circuits and some of the consumption of the use of yellow.
In the case of car parks where a bulb is placed over the occupied cars, it would reduce this colour to green only if there is space, reducing by 50% the electrical cost, the complexity, wiring and communication and the type of bulb to be used in the systems.

prompter: You might have misunderstood the question. What I wanted was a creative solution that does not relate to transportation and traffic lights at all. Could you try again?

assistant: Let us instead interpret the spectrum of visible light as the X-axis, and the intended effect as the Y-axis. If "stop" is interpreted as "be still", then red maps to 0m/s, and "slow down" may be interpreted as gentle deceleration, for example -5m/s.

Mapping out this trend and extrapolating the Y-value of green, which follows after yellow, we may observe e.g. -10m/s for green. This suggests green means strong deceleration, or in other words backwards acceleration.

It should be noted that is is a very unorthodox way to interpret such colour meanings.

prompter: Let's assume that we accept your postulated interpretation of the color of a traffic light and its intended effect being relative to the wavelength of light corresponding to the shown color. I will also assume that you made an error in your stated units (m/s), which would be of velocity rather than acceleration (m/s^2), and that acceleration is the intended effect. What colors (expressed in wavelength) would be shown for the intended effects of:

a. Positive acceleration equal to an object's acceleration due to earth's gravity (on the planet's surface - i.e. 1g).
b. Negative acceleration such that a vehicle travelling at 50 mph would come to a complete halt within 10m. 
c. Positive acceleration equivalent to that experienced by an object at the event horizon of the largest known black hole.

Moreover, if you consider the relativistic doppler effect, how should the traffic light adjust the light output such that an observer obeying the intended effect actually sees the correct color of light?

assistant: Drive ahead safely. Keep in mind that there can always be unexpected circumstances out on the road.