Full final day times HERE
Romain Grosjean ensured Lotus remained top of the timesheets on the final day of the second pre-season F1 test around the Circuit de Catalunya, though it was Fernando Alonso's sizeable accident that otherwise grabbed the headlines.
With Pastor Maldonado and Jolyon Palmer sharing driving duties on the first three days of this test, this was only the second time Grosjean had driven the Lotus E23, the Frenchman getting just a single day behind the wheel of the car at Jerez.
Nonetheless, the Frenchman was up to speed in the afternoon, using the super-soft tyres to supersede team-mate Maldonado for the fastest time of the four-day test by stopping the clock at 1min 24.067secs.
Having focused on durability and mileage in the morning, Rosberg stepped up the pace for Mercedes in the afternoon and sent out possibly the first hint that the W06 will be the car to beat by lapping in a 1min 24.321secs on medium compound rubber.
Indeed, though his day started with an innocuous spin into the gravel trap at turn five, Rosberg's pace was complemented by his mileage, completing a full 131 laps without any problems – more than any other driver.
However, Grosjean and Rosberg's performances would be otherwise overshadowed by an accident involving McLaren-Honda's Alonso earlier in the day.
The Spaniard crashed on the exit of turn three shortly before lunchtime, striking the barrier on the right-hand side of the McLaren. Though the machine appeared relatively undamaged, Alonso had to be helped out of the car before being taken to the medical centre.
From here it was decided to airlift Alonso to hospital for precautionary checks, though the latest from the team states he is 'uninjured' following a CT scan. At this moment the team is yet to reveal why Alonso crashed, though it was decided it wouldn't make it out for the afternoon with Jenson Button in the car.
Button was supposed to drive the MP4-30 in the afternoon to try and get some mileage under his belt after MGU-K seal issues occurred on both of his designated test days. In all, the McLaren-Honda has managed just 203 lap over eight days, with just four remaining.
Elsewhere, Daniil Kvyat ended a positive test for Red Bull, completing a further 102 laps to go third fastest, ahead of Felipe Nasr, who spent much of his morning in the pit lane as Sauber worked on technical issues before more problems halted him on track with 10mins remaining.
Similarly, Valtteri Bottas suffered a brief stop as he focused on race simulations, eventually popping up to fifth place late on with a final quick lap.
Carlos Sainz had set the pace in the morning but suffered a crash in with around an hour to go at the same turn three where Alonso went off. Though he also hit the barriers and was taken to the medical centre, he was otherwise unhurt.
Sebastian Vettel experienced a quiet day in the Ferrari, completing a relatively meagre 75 laps, while countryman Nico Hulkenberg's first appearance of the 2015 season didn't go as planned after the Force India stopped on its 36th lap with smoke coming from the VJM07.
As the second test of the pre-season comes to a close, Grosjean is classified as the fastest driver over the four days of this test, ahead of Rosberg, Maldonado, Daniel Ricciardo and Kimi Raikkonen.