Track limits for the Portuguese GP have been further tightened up after Race Control found further areas the drivers were exploiting during Friday practice.
Originally, three corners were identified as particularly contentious zones, with Turn 1, Turn 4 and 15 exit kerbs being used as the outer track limit.
Turn 14 has now been added to that list, with the track limits there being defined. Drivers must ensure that they keep at least one wheel on the white and red kerb.
If a driver exceeds this kerb in practice or qualifying, his laptime will be deleted.
The drivers will then be given three chances during the race. Should a driver exceed the limits at these three combined corners on three separate occasions, he will be shown the black and white flag and will be referred to the stewards for a penalty.
This happened to AlphaTauri's Yuki Tsunoda during the Emilia Romagna GP, while McLaren's Lando Norris fell foul of the rule in qualifying as he lost out on a qualifying time that would have placed him on the front row.