Felipe Massa went fastest for Williams as the final day of Formula 1 pre-season testing at Jerez ended under red flags.
Kevin Magnussen, who topped the times on day three, ended his second day as a McLaren driver in the barriers at Turn 10.
Daniil Kvyat's Toro Rosso also stopped out on track at the same corner, possibly contributing to the accident.
It had otherwise been a successful day for McLaren and Magnussen, who - despite a spin at the final chicane - racked up 110 laps.
That tally was only bettered by Ferrari's Fernando Alonso, who managed 115 in a trouble-free day for the F14 T.
Mercedes' Nico Rosberg had led the way in the morning with 91 laps, but in order to balance mileage handed over to Lewis Hamilton for the afternoon. The Briton turned in 41.
That was in stark contrast, once again, to reigning champion Red Bull, which managed just seven laps before calling an early close to a troubled four days.
The team finished at the foot of the overall timesheets, and with the least number of laps completed.
As it floundered, Mercedes hit the fore with the first full race simulation, conducted by Rosberg in the morning.
Hamilton, Alonso and Massa attempted long runs of their own during the afternoon, only to be cut short by a trio of red flags which produced a stunted end to the test.
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What the drivers think of F1 2014.