THE Gold Coast is in gridlock after a serious truck crash on the M1 southbound at Robina.

All southbound lanes were closed after the truck lost its load of cars, dumping them on to the road and over the bridge into the water below.

One car was hit by one of the stray vehicles and the occupant was trapped for some time.

The crash has caused widespread traffic chaos with major delays as the Coast’s feeder and arterial roads grind to a halt as motorists try to avoid the M1.

The M1 is currently from Reedy Creek to Robina northbound is at crawl along with soundbound lanes from Nerang to Robina.

media_camera The scene of the crash on the M1 this afternoon. Picture: David Clark

One southbound lane is open on the motorway at Robina but motorists are being urged to avoid the area.

Emergency services are still at the scene of the crash where two men were injured.

It is understood the truck carrying luxury vehicles was travelling along the motorway when one of the cars fell off, hitting another vehicle near Robina Parkway about 2.35pm and trapping the driver.

media_camera A crash happened on the M1 southbound about 500 mtrs north of the Robina Parkway exit earlier today between a truck carrying cars and a station wagon. A car ended up in the creek below the road. Picture: Richard Gosling

The truck is believed to have smashed into the guardrail, while another vehicle off the truck plunged over the bridge and into the water below.

media_camera A multi-vehicle crash on the M1 near Robina has all southbound lanes closed. Picture: @QldAmbulance

The male truck driver managed to escape before the truck burst into flames but he sustained chest, head and lower leg injuries.

media_camera A multi-vehicle crash on the M1 near Robina closed all southbound lanes earlier this afternoon but one has reopened. Picture: David Clark

The driver of the other vehicle has a shoulder and possible spinal injury and has been transported to Gold Coast University Hospital in a stable condition.

Gold Coaster Michelle McGeorge said her son Matthew was riding underneath the bridge at the time of the crash.

The accident was just meters away from a path underneath, which is a popular spot for kids on bikes and walkers, according to Mrs McGeorge.

media_camera The mess created after a serious crash on the M1 near Robina. All southbound lanes are closed. Picture: Richard Gosling

A fire on the median strip near the Smith Street Motorway ramp caused the inner lane to be closed while firefighters battled the vegetation blaze at 3.30pm.

It is unknown what sparked the blaze.

media_camera A crash happened on the M1 southbound about 500 mtrs north of the Robina Parkway exit earlier today between a truck carrying cars and a station wagon. A car ended up in the creek below the road. Picture: Richard Gosling

UPDATE: Southbound lanes closed on the Pacific Motorway at Robina following multi-vehicle crash. #9News pic.twitter.com/QFTYDP41Ml — Nine News Gold Coast (@9NewsGoldCoast) June 30, 2016

media_camera A multi-vehicle crash on the M1 near Robina has all southbound lanes closed.