Traffic signal lights – impending change

Having traveled in many European countries, traffic control lights in there usually flash green for a few seconds to announce that the light is about to change to red. Austin, TX is notorious for red light runners, and it would seem to be painfully obvious to our State of TX equipment and traffic control gurus that the more lead time a driver has to anticipate the need to slow and/or stop, the better, and the obvious benefit would be a decrease in collisions. Even Mexico has this method. Why don’t we in the USA have this as a design standard?