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.
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