Two-second rule two seconds as inadequate, and recommend a three-second rule. German law requires a minimum 0.9 second distance but when tested under relaxed conditions researchers found that their test subjects spent 41% of the test time at following distances under 0.9 second. The United States National Safety Council suggests that a three-second rule—with increases of one second per factor of driving difficulty—is more appropriate. Factors that make driving more difficult include poor lighting conditions (dawn and dusk are the most common); inclement weather (ice, rain, snow, fog, etc.), adverse traffic mix (heavy vehicles, slow vehicles, impaired drivers, pedestrians, bicyclists, etc.), and
Flemming Rule from its welfare program in what became known as the "Louisiana Incident." This was done because the children had been born outside of wedlock, and were considered illegitimate by the state. Similar types of welfare denial had occurred in other states. In response to this, the Louisiana Department of Health, Education and Welfare, administrator of the income assistance program, implemented the Fleming Rule. A 1997 article by Claudia Lawrence-Webb claimed that the child welfare system had problems fairly representing children of color and signified this problem was due to the Fleming Rule. Webb suggested that the rule was implemented poorly,