Yellow does not mean speed up. It means slow down.
When you get the yellow light in your life, take heed to what is going on. Is it your health, your family, your husband/wife, the children? Could it be your business, your friends, your spiritual condition, or your finances? You have gotten the yellow light for a reason. Don't ignore it, thinking it is unimportant. Without the yellow light, there would be a whole lot of wrecks! You have the control of avoiding those wrecks in your life by paying attention to the yellow light... and slowing down and attending to business.