This year's Canadian Grand Prix will feature just one DRS zone, as opposed to the two that were available last year at the Circuit Gilles Villeneuve.
In 2011 drivers could open their rear wing on the straight exiting the Turn 10 hairpin and the start-finish straight in Montreal.
However, the second zone has been scrapped as it was deemed too easy to overtake, while the zone at turn 10 has been shortened by 50 metres.
You can follow live text coverage of both qualifying and Sunday's race on a hugely exciting weekend on Sports Mole.
