Dimension Date are on the front - Mark Cavendish made it through that crash unscathed.

Quick-Step are still riding so Fernando Gaviria must've done too.

The crash happened about halfway down the bunch so most of the sprinters - if positioned correctly - should have got through.

Rigoberto Uran has been caught behind and is chasing back on with Education First team-mates.

The four-man break have a lead of 30 seconds with 4km to go.

Quick-Step are still driving on a reduced bunch in pursuit of the front four.

Carnage on the road, several riders still down.

A big spill in the peloton!

The bunch has been split in two.

Rob Hayles
Ex-GB cyclist on BBC Radio 5 live, in France

The peloton didn't like that turn from Burghardt - he split it up at the front.

This is really in the balance.

Dimension Data and Quick-Step now to the fore in service of Gaviria and Cavendish.

The gap is down to 45 seconds.

That was a big km for the peloton - Bora's Marcus Burghardt stringing it out with a fearsome turn.

Bora now on the front of the peloton for Peter Sagan.

The four-man break are 55 seconds out in front.

Rob Hayles
Ex-GB cyclist on BBC Radio 5 live, in France

The time is just not coming down quick enough!

Dimitri Claeys pours a bottle of water over his head to cool himself down for the scorching run-in to Sarzeau.

He has Cofidis team-mate Anthony Perez with him in the break.

Their sprinter Christophe Laporte is injured and won't be contesting a bunch sprint today.

Could they pull off a remarkable win? The break still have a one-minute gap with 8km to go.

The gap sticks at 1'02'' through 9km to go for the break as the peloton go under 10km to go.

Perez, Claeys, Van Keirsbulck and Cousin zip through the 10km to go banner.

The peloton are about a km further back, a gap of 1'06'' - this will be tight but the bunch are still the favourites.

Rob Hayles
Ex-GB cyclist on BBC Radio 5 live, in France

The riders in the break are having to commit to this into a headwind and that will be slowing them down. It could be the thing that prevents them staying away.

The peloton are shaving off about 10 seconds per km as it stands.

The gap is at 1'30'' with 13km to go but coming down all the time.

Quick-Step strongman Tim Declercq swings off from the front, having buried himself in service of bringing back the break.

This is getting tense. Any pause in the peloton could see the chase fail.

FDJ agree to help out on the front in service of their sprinter Arnaud Demare.

The peloton continue to bear down on the leading quartet, bringing the advantage down to 1'46'' - can the breakaway pull off an unlikely escape?

The technical issue has been solved - Tom Fordyce, Rob Hayles and Gareth Rhys Owen are back on air to provide live commentary of the frantic finish to stage four.

Tune in by clicking the tab at the top of the page...

Mark Cavendish
Winner of 30 Tour de France stages

It's great to have three sprint opportunities in the first four days. This stage is just really about getting through the kilometres. There is nothing of great difficulty and there's a nice fast run-in to the finish. It does drag slightly uphill in the last kilometre but with it being a straight road and not coming in off a corner it should mean a bunch sprint.

It will be important to try not to jump too early on a finish like this with a slight rise. Some guys will jump early and fade. There's likely to be a headwind at the finish, so I'd look to try and come from behind and use the slipstream of others to come through and win.

Image source, Tour de France

Can Mark Cavendish deny Fernando Gaviria a second stage win?

He actually picked the Colombian for victory in his stage-by-stage guide for BBC Sport.

Here is what the British sprinter said about today's finish...