State law (RCW 46.61.055(2)(a)) specifically states that you MAY enter an intersection on a yellow light, until that light turns red:"Vehicle operators facing a steady circular yellow or yellow arrow signal are thereby warned that the related green movement is being terminated or that a red indication will be exhibited immediately thereafter when vehicular traffic shall not enter the intersection." In addition, the normal response time to a stimulus is between one and one and one quarter seconds for a normal driver. They cannot arbitrarily assign a length of four seconds to all yellow lights, without regard to the posted speed limit on that roadway, because four seconds may not allow a reasonably perceptive driver to react, AND STOP, at higher speeds, given the braking ability of the vehicle combined with the coefficient of friction of the roadway (I'll spare you the mathematics). Drivers who are rearended while attempting to stop, are victims of drivers behind them, who are violating RCW 46.61.145(Following too closely). This cannot be attributed to the changing of the light, as the drivers of the following vehicles should have left enough room for ANY emergency braking by the lead vehicle(e.g. a small child running into the roadway).