Nico Rosberg, Carlos Sainz, Nico Hulkenberg and Daniel Ricciardo have offered positive 🎃fꩵeedback about the latest evolution of the 'Halo' cockpit protection device followed its most comprehensive real-world test yet at Spa-Francorchamps.

Following the FIA's plea to teams urging them to help further the device's development for a 2018 i🌠ntroduction, four teams - Red Bull, Mercedes, Force India and Toro Rosso - would run the controversial device for varying programmes during Belgian Grand Prix FP1.

Significantly, Rosberg complet♊ed two runs, with the second on the super-soft tyres seeing him stop the clock at 1min 48.348s, which would go on to stay top until the chequered flag. As one of the device's most vocal advocates, the Mercedes driver was impressed with the safety gains.

RESULTS: Belgཧian Grand Prix - Free practice results (2)

"It was good to t𝔉ry it and they've done a great job with it because it doesn't disturb me at all when I'm driving and increases the safety a lot," he said. "I know it's not nice looking from the outside, of course, it doesn't make the cars prettier but if it's such a big step in safety then I think it's a good thing."

Ricciardo and Sainz, me✃anwhile, were pleased to note that visibility - their main concern - ꦉwas not as impaired as they had expected.

"Visibility is not a problem," said Sainz. "Obviously when you leave the box, you have this thing in the middle which disturbs you a bit, but at the end of the lap you don't even notice it's there anymore. Your eyes get used to it, th✱ey get used to looking across it, that's why we have two eyes! That's it really.

"It is definitely still a work in progress," added Ricciardo. "The first time I've run it - I'd only run the aero screen before. So it was definitely different. But it was definitely good to test it, and to test it here. That is what💦 we have to keep doing for now, so more drivers can test it before the end of the season. And just gett🐟ing feedback. So I will give some feedback tonight. We've been given a sheet, a bit of homework. Generally speaking, not too bad."

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Having criticised the prospect of such a device as recently as the German Grand Prix, Hulkenberg admits he was surprised by the relativ🐲e lack of distu🦩rbance.

"It was a weird feeling. I don't know, it felt weird. To have something there which limits you going forward was ꦿobviously a new experience. I have to say the visibility wasn't too bad. I dﷺon't think that was a big issue but certainly it will take time to get used to."

Dubbed as a chance for the Halo to get a good visibi🦹lity test by coming through Eau Rouge at racing speed, Rosberg says there is scജope for making the design even tighter.

"[Eau Rouge was] No problem a🐲t all, you don't even notice the top part. I think they can e🅰ven come down with that because LMP1 is lower anyways. So for sure they could go lower."

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