Ferrari driver Kimi Raikkonen says that the 'halo' device makes very little difference when driving a Formula 1 car, after he debuted a prototype on Thursday.
Raikkonen completed an installation lap in the SF16-H at the Circuit de Barcelona-Catalunya on Thursday, with the sport set to introduce increased cockpit protection for drivers in 2017.
"This morning I tried the Halo protection device and the difference to the usual driving was surprisingly small," he said.
"The visibility is just a little bit limited at the front but I don’t think this is the final version of the device, so it can be improved further."
Raikkonen went on to clock the quickest time of the seven days of pre-season testing so far after utilising a set of Pirelli's Ultra Soft tyres shortly before the lunch break.
"It was one of our best days of testing," said Raikkonen, who carried out a race simulation.
"We could run without a single stop, except for the red flags on track. Maybe we could have been faster on some laps, but in general the feeling was fine and we are more or less happy with the way things are going. Of course there’s always room to improve and work to do."