@Hard_@_Work: The teams have to submit their usage to the FIA, which is able to carry out checks too.
Wind tunnel testing and CFD usage is all quite tightly controlled and policed. Most teams don't have a wind tunnel capable of testing anything more than a 60% model.
Bottas has move up to second with a 1:24.944 on the medium tyres. Updated times and lap counts coming your way.
As I was updating the times, Bottas set a 1:23.995 on the softs. That's 0.495s off Massa's best with softs yesterday.
@JayMcKenzie: It was the team at Brackley and Brixworth in the UK. Funded by and helped by Mercedes in Germany, but essentially a separate bunch of guys.
@mfbull: There is nothing showroom about the safety car - I've had a close look at it. But it's quick enough to do the job and it keeps us entertained on GP weekend Thursdays when Maylander does his "sighter laps" and spends most of his time going sideways through the corners.
@Rawpace: The soft and super-soft are not well suited to this track, but at some point the teams will have to run at heavy fuel on those too. Even though we all enjoy qualifying and seeing the cars on the limit, the points are earned on Sunday when the cars start the race fat with fuel. As a % the cars spend way more time per season with heavy fuel on board, so that is why the teams run heavier fuel for most of testing.
I'm just back from lunch and can only apologise for my lack of hair.
@McLaren_Fan: It's hard to tell. They may be running at higher settings but with heavy fuel, but we don't know for certain. We'll try to find as much as we can from the team at the end of the day
I'll be taking over from Laurence, just in time to report a red flag for Kvyat. The Russian has stopped at Turn 1
The track is green again and there's a flurry of activity. Vettel is out on hards, Nasr on mediums.
@Prithvi: Looks it, 21 laps might not seem a lot but for a first day out of the garage that's good going so far. Shows how much more prepared Mercedes power is to hit the ground running compared to the likes of Honda at this stage.
@mfbull: Both supremely confident, as you would expect. Ericsson is very keen to shake off the "pay driver" label and had some very interesting insights about his time at Caterham last year. All will be revealed however, with both features likely to run in the next week.
The McLaren is currently about 15kph down on the speed trap which would suggest to me they still have not turned the whick up on that car. Button is up to 68 laps though, so there's progress for sure at McLaren.
@Romain: At the moment its Williams, but it's very difficult to gauge these speeds until we know if engines are turned up fully.
@achal: Yes, testing goes on until 1800 local time.
@JasonArellano: Lap times have been down on the rest - his last was a 1:31.091 - but given McLaren's limited running so far these laps will be about searching for reliability and putting the crucial mileage on the Honda engine. I doubt we will see a race simulation from McLaren at this stage. It's an issue-free day for the first time this winter and they'll not want to push the engine into another problem.
Mercedes is back out on track.
@MrTuK: Yes, it is, but its also about racking up mileage. McLaren will be gaining valuable data from this - 60 laps with the wick turned down is better than five with it turned up.
@JayMcKenzie: It's way too early to say, yes. We don't know where Mercedes' rivals are and whether the pecking order has changed. All in all predictions in pre-season are fairly pointless.
Rosberg is back out on the medium tyre. Button and Maldonado also on mediums.