<Li> A flashing amber indication is a warning signal . In the United Kingdom, a flashing amber light is used only at pelican crossings, in place of the combined red--amber signal, and indicates that drivers may pass if no pedestrians are on the crossing . </Li> <Li> The red signal prohibits any traffic from proceeding . </Li> <Li> A flashing red indication is treated as a stop sign . </Li> <P> In some countries traffic signals will go into a flashing mode if the Conflict Monitor detects a problem, such as a fault that tries to display green lights to conflicting traffic . The signal may display flashing yellow to the main road and flashing red to the side road, or flashing red in all directions . Flashing operation can also be used during times of day when traffic is light, such as late at night . </P>

When the traffic light is red it means