Lewis Hamilton of Mercedes was the fastest driver in Friday practice for Sunday's German Grand Prix, topping the timesheets from team-mate Nico Rosberg.
Hamilton posted the quickest lap of the day in 1 minute 18.341 seconds around the 4.574-kilometre Hockenheim track, with Rosberg 0.024 seconds behind.
Red Bull's Daniel Ricciardo was an impressive third, just 0.102 seconds off the pace of Hamilton, but reigning world champion Sebastian Vettel was ninth.
The teams will hope to learn from the sessions after a number of drivers went wide on turn one, while Kamui Kobayashi had to make a sharp exit from his Caterham with smoke pouring from the car.
Marshals were soon on hand to extinguish the fire.
Rosberg currently leads the world championship but, with Hamilton only four points behind, the Briton could overtake him with his sixth win of the season on Sunday.
Williams development driver Susie Wolff was given another chance in the first practice session, having been stopped by engine failure in a similar session at the British Grand Prix.
The 31-year-old Scot ended in 15th place after a first lap scare when her car could not change gear. She posted a best time of 1:20.769.
"It was so nice to be out on track every lap, going quicker and getting more feel in the car. I'm just really happy to have completed a successful FP1 session," Wolff told BBC radio.
"The team did a good job of preparing me - I knew what to do on every lap of the session. It feels so good to be driving a race weekend."
Wolff's entry at Silverstone made her the first woman to take part in a Formula One race weekend in 22 years. The last female driver to enter a race was Lella Lombardi in 1976.
Third practice and qualifying is on Saturday before the race on Sunday.
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