The DRS - or, as I like to call it, the Driver Retirement System - is my most hated aspect of current Formula 1.
At some tracks, it makes overtaking far too easy, but at Barcelona this was not so. Lewis Hamilton could not get close enough to Sebastian Vettel to attempt to pass him, while Kimi Raikkonen had the same problem when behind Valtteri Bottas.
Even with the DRS, it was not easy to pass. And the reason for this is incredibly simple.