The United States and Brazilian Grands Prix bring down the curtain on this technical era of Formula 1 and represent the last hurrah for the raucous, high-revving 2.4-litre V8 engines and the current aerodynamic rules.
With such far-reaching changes looming, development of the current cars has tailed off for all but a few teams and most of the past two weekends has been dedicated to the 2014 season.
The grey line shows the vortex path.
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