aerodynamics

If the wind is head on, it gives the car more grip, as the aerodynamics become more effective.

No-one really likes it, but it's considered necessary at least to make overtaking possible when aerodynamics are so important.

It suggests a car with aerodynamics that are not consistent or predictable.

That added to aerodynamics upgrades to the car to the front wing and suspension introduced in Austria led to the largest margin any pole winner has had in percentage terms all season.

So the rule-makers turned to moveable aerodynamics, reducing drag on the straights so the cars were in the braking zones for longer.