In order to get 1 million spectators to the Gold Coast during the Commonwealth Games, some of Brisbane's busiest commuter train lines will be replaced with buses.

When trains will run on your line Airport: Weekday peak every 15-30 minutes, off-peak every 30 minutes, weekends every 30 minutes. Beenleigh: On some days, buses will replace trains at most stations. Service frequency will change regularly. Check Translink website. Caboolture: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Cleveland: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Doomben: Weekdays every 30 minutes, Saturday hourly services, no Sunday services. Ferny Grove: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Gold Coast: 24-hour services during the Games. Train frequencies will change regularly. Check Translink website. Ipswich: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Rosewood: Weekday peak every 30 minutes, off-peak every hour, weekends every hour. Redcliffe: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Shorncliffe: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Springfield: Weekday peak every 15 minutes, off-peak every 30 minutes, weekends every hour. Sunshine Coast: Weekday peak every 30 minutes, off-peak every 90 minutes, weekends every two hours. Source: Translink

Transport Minister Mark Bailey said services on the Gold Coast line would run six times an hour in most cases, with eight services an hour planned for peak periods.

The Gold Coast's light rail will also have services every six minutes for a nine-hour period, while a shuttle bus service will connect the "spine" of venues in the region.

The Commonwealth Games timetable will operate between March 30 and April 20, with an extra 6 million journeys expected.

But some of Brisbane's busiest commuter trains will have reduced timetables and will be replaced by buses, including most of the Beenleigh line.

"You will see a high frequency bus service for a lot of the Beenleigh line, with the exception of Woodridge, Coopers Plains and Yeronga, which will have express services down to the Gold Coast," Mr Bailey said.

"At various times on the network when we do maintenance, there will be bus supplements. In this case it is similar except we have made them high frequency to minimise the inconvenience,"

Mr Bailey did not think the replacement buses would have an big impact on commuters.

"It will be quite convenient. In some cases it will actually be faster, in some cases it will be similar, and in some cases it will be a weeny-bit slower," he said.

"It will just depend a bit on the network."

Services on other SEQ rail lines will be reduced to accommodate for a three-fold increase in activity on the Gold Coast and Airport lines.

"We've got a finite level of rollingstock and drivers. You have make changes if you are going to make triple the trips to the Gold Coast and Commonwealth Games," Mr Bailey said.

Queensland Premier Annastacia Palaszczuk told Parliament last year "categorically" there would be no line closures, but Mr Bailey insisted the Beenleigh line would have a "continuous service" with the replacement buses.

People can find information about public transport and road closures on a new Commonwealth Games transport website.

The website is a separate initiative, not advertised on the main Commonwealth Games site or Main Roads information page.

The report predicts in some sections of the road there will be a "significant road safety risk" for motorists. ( Damien Larkins, ABC Local, Image digitally altered )

Day-long congestion predicted on Gold Coast stretch of M1

The Commonwealth Games transport plan also includes speed limit changes to the M1/M3.

The M1 is the major road linking the Gold Coast to Brisbane and has been plagued by traffic problems for years.

A Department of Transport forecast, which was released to the ABC under a Right to Information request, found that during the Games states there will be a "very high crash risk" on both sides of the M1 motorway south of Mudgeeraba at exits 82 and 85.

The plan also warned of expected congestion along virtually the entire Gold Coast strip of the motorway.

It predicted all-day congestion for the duration of the Games in the southbound lanes of a 33-kilometre stretch of the road from Coomera to Tugun.

The Government announced on Sunday the speed limit would be lowered from 110kph to 100kph between Logan and Gaven, while there will be a 10kph reduction at Eight Mile Plains.

Commonwealth Games chairman Peter Beattie said transport was the biggest challenge for the event.

"You can't run an event this big without some inconvenience. But we're minimising it by long-term planning, consulting," he said.

Traffic chaos due to fatal accident

Just an hour after the transport announcement, a man died after he was struck by a car on the M1, causing heavy congestion towards Brisbane.

Police said the man was inspecting his broken-down vehicle in the emergency lane, when he was hit from behind at about 11:30am.

The man was caught underneath his car and died at the scene.

The incident occurred about a kilometre north of the Smith Street on-ramp near Helensvale, with police closing two lanes while the Forensic Crash Unit investigated.