Marcus Ericsson is walking down the pitlane and gets a massive round of applause from the Monza fans. He looks OK. A word on some marshals who appeared to be the wrong side of the barrier close to where the crash happened. They have also had an incredibly lucky escape as well.

Image source, AFP

Image source, Reuters

Jeremiah Kariuki: Watching the slow motion reviews, one would conclude Ericsson was quite lucky. The car seems to have taken some few aerial flips rolling several times. Clearing that mess and ending the red flag will take some time. That's a massive crash. The car is a complete mess. But Marcus Ericsson looks OK.

Rachel T: Good grief, that was a massively horrible shunt. DRS failure - Ericsson was a passenger.

Rod Peel‏: Looking at the replay of Marcus Ericsson’s accident I notice that there was a marshall in front of the Armco. Lucky guy!

Jolyon Palmer
Former Renault driver on BBC Radio 5 live

He'll be very shaken and probably have some aches and bruises.

That is two very, very scary moments for the Sauber team in less than a week.

Remember, Fernando Alonso went over the top of Charles Leclerc at Spa (pictured below) and now Marcus Ericsson, after what appears to be a DRS failure, smashes at high speed into a barrier.

Ericsson has gone off to be checked out by the medics. Let's just hope he is OK.

Image source, Reuters

Andrew Benson
BBC Sport’s chief F1 writer at Monza

Jolyon Palmer, commentating, says he thinks the DRS (drag reduction system) might not have shut on Ericsson's car - from watching the final replay. He's not completely sure

Palmer is right - the DRS did not shut.

Jolyon Palmer
Former Renault driver on BBC Radio 5 live

He's pitched left under braking. It flips over three or four times. It's a huge impact. It's a dramatic start to FP2. Are there any water remnants from FP1 when it was very wet or is there an issue with that Sauber? That's a very strange accident.

Andrew Benson
BBC Sport’s chief F1 writer at Monza

Massive, massive crash for Ericsson at Turn One. Flips, somersaults, the lot. He's fine. What on earth happened?

"No idea what happened there. I'm OK," says Marcus Ericsson.

A huge crash involving Marcus Ericsson's car. Wow!

He is driving on the straight, veers left into the wall, he hits it at incredible pace, and bits fly off everywhere. After the damage his car rolls and rolls and rolls. His Sauber is absolutely mangled.

Seeing it again there is no-one around him, he loses it, spins, rolls into the wall and then his car rolls at least another three times.

Jolyon Palmer
Former Renault driver on BBC Radio 5 live

Lando Norris was three-tenths of a second off Alonso when they were both out together in first practice. I think it's quite impressive. He's not driven the car much in the wet, if at all.

We are live with our 5 live team of Jolyon Palmer, Jennie Gow and Jack Nicholls. Listen via the play button at the top.

Jacob Smith: 21 races means more F1 so that can never be a bad thing! Although if a few were dropped to help budgets then it would be a small sacrifice to pay for a big relief on some teams.

Independent mp: If next year is as interesting as this year lets have more races - if it is as predictable as previous years it is 18 races to many.

Amit Mandalia‏: It’s good to see the calendar spreading out a bit to start earlier and finish later but the sport needs to make sure it doesn’t add too many races for the sake of it, 18-20 would be a reasonable number throughout the year in my opinion.

It's a lot brighter than it was earlier on. This is going to be a very hectic and very busy session. Remember, Sebastian Vettel only managed four laps, Lewis Hamilton six and Valtteri Bottas eight.

Here's the man who was fastest in practice session one. Yes, I have put the right picture in.

Sergio Perez of Force India led the way, in a rain-hit opening session. We go again at 14:00 BST.

Let's get your thoughts on all that then. Twenty-one races for 2019, the same as this year.

Is it too many races, is it not enough? Is the season too long, would you rather see a 12-month calendar? Disappointed there are no new races? Happy to see Japan and Germany stay?

You know what to do. Tweet us using the hashtag #bbcf1 and your words will be read by the world.

Andrew Benson
BBC Sport’s chief F1 writer at Monza

The first draft of the 2019 calendar has been announced over the lunch break and it’s basically this year’s schedule but spread out more.

A deal has been struck to keep Germany on the calendar, helped by Mercedes being title sponsor. And Honda has formally put its name to the Japanese Grand Prix, although that doesn’t really change anything as Suzuka is owned by them anyway.

The season starts a week earlier than this year, in Australia as usual, and finishes a week later, in Abu Dhabi as usual.

Have a read of our story.