The diagram shows a sequence of events. Which processes are indicated by letters A and B?

answer; the above statement is (true);

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

geologic time scale (for gradpoint) =)