Williams pair Valtteri Bottas and Pastor Maldonado were left to rue traffic issues after another tough qualifying session ahead of the Indian Grand Prix.

Bottas was the best of the pair as he was able to make it through the second stage of qualifying but then lost tyre temperature when he came across a number of slow cars as he came round to start his final timed lap - leaving him 15th on the grid.

Maldonado however endured a more troubled session as he failed to make it past Q1 after hitting traffic himself on track, although chief race engineer Xevi Pujolar said he was confident that both drivers could make forward progress on race day.

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"We had to change our run plan in FP3 as the session was delayed and shortened due to poor visibility, but the car balance was improving on both tyres in line with the track conditions," he said. "We knew it would be extremely tight in qualifying with getting the tyres in the correct temperature window critical to getting a good lap.

"Unfortunately Pastor was hampered by traffic on his first lap in Q1 and didn't have enough time to cool the tyres down ahead of his second flying lap which compromised his time and left him 18th. It worked well for Valtteri in Q1 as he had good track position for his second lap on option tyres and made it through into Q2. In Q2 he came across traffic in sector three on his out-lap so the tyres weren't up to temperature for the start of his flying lap and he qualified 15th.

"The soft option tyre is especially sensitive to blistering and graining with the medium being more robust. So we expect to see a number of strategies in the race with team's opting to run the soft tyres at different stages of the race, which will open up more opportunities to gain positions."