Isack Hadjar drove the new Red Bull on the first day of pre-season testing
Formula 1 drivers gave a cautiously positive reaction to this year's new cars at the end of the first day of pre-season testing in Spain on Monday.
Mercedes driver George Russell said: "The cars looked really cool out on the circuit and that's positive for our sport.
"They are quite different for us as drivers but, once you get your head around it, driving them is quite intuitive.
"It's enjoyable being behind the wheel and there's a lot for fans to look forward to with these new regulations."
