Williams head of vehicle performance Rob Smedley expects the Spanish Grand Prix to give a true picture of competitiveness for the remainder of the season.

While Mercedes has been dominant throughout 2014 so far, it has only been joined on the podium by one team at a time as competitiveness has fluctuated, with McLaren, Red Bull, Force India and Ferrari all taking turns finishing in the top three. However, Smedley believes Barcelona will be significant in giving a real indicator about which F1 teams will emerge as best of the rest to take the fight to Mercedes.

"Spain is a good leveller," Smedley said. "Getting back to Europe gives teams the opportunity to bring further upgrades, which we will also be doing. Barcelona and the following two or three races gives everyone a good indication of how the rest of the season will play out and who has made the most progress since the start of the season.

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"The teams and drivers know the track well, meaning we can gain a lot of accurate data on how the upgrades are working. This knowledge is also very useful when back in factory; it means we can replicate the track and conditions very closely."

And Smedley added that he is keen to understand just how much progress Williams has made relative to the rest of the field.

"The track itself has a very good mix of long straights, some high speed corners like Turn 3 and some more technical and slower sections. Turn 3 is important for managing tyre wear so it's something engineers and drivers have to monitor throughout the weekend. We feel prepared going in to the weekend and are now interested to see where we are in comparison to our competitors."