Editing Duration of the race

== Defining the race ==
The exact definition of the duration of the race is often a significant question, particularly in cases of wet weather or significant incidents. The start of the race occurs when the start signal is given (typically by the five lights on the grid), from which point the lap count increments by one each time the leading car crosses the control line.  
The finish of the race occurs separately for each car, and is when they cross the control line whilst the end-of-session signal (the ‘chequered flag’) is displayed.  The end-of-session signal is displayed in three scenarios
# the full number of laps has been completed;
# the time limit has expired; or
# a discretionary decision has been made not to resume the session.