It's bank holiday weekend, one of the busiest travel periods of the year, and the M20 in Kent has shut after a bridge collapsed.
The motorway is closed between junctions three and four because of a "vehicle striking a bridge" on the eastbound carriageway, according to Highways England.
Pictures show a lorry colliding with a pedestrian bridge, which then collapsed onto the carriageway below.
The crash has caused huge tailbacks - Michael Roberts is stuck in the traffic on his way to Reading Festival with his pregnant fiancee.
"We are very close to the front," the 31-year-old said. "30 seconds earlier and we could have been underneath it."
He said his fiancee has been struggling in the back of the car after two-and-a-half hours of waiting with no movement.
"The main frustration is that we have been given no information.
"We had to go to the front of the queue to find out what's going on. It's carnage there."
South East Coast Ambulance Service said a motorcyclist aged in their 50s had been taken to hospital in Tunbridge Wells with suspected broken ribs.
A statement from the service said: "Police are treating this as a major incident and the M20 has been closed in both directions to allow this incident to be dealt with. Traffic will be heavier than usual."
Twitter users stuck in traffic posted pictures of the scene.
There are reports of traffic moving again, as cars are directed onto the other side of the motorway.