Due to their poorer performances so far this season, Mercedes will have the option of running more wind tunnel testing in the second half of the year. This is due to the aerodynamic testing restrictions [ATR] in Formula 1 switching for the second half of the year, based on the teams' Constructors' Championship positions after the Canadian Grand Prix. The ATR began last year with the hope of helping bring the field closer together by limiting the amount of aerodynamic and CFD [computational fluid dynamics] item tests with the equivalent of a ‘success penalty'. Essentially, the higher the team is in the Constructors' standings, the less they're allowed to use the wind tunnel and test...
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