Southeast Queensland motorists are paying the price of heavy congestion, with some commuters being forced to travel at only one-quarter of the allowed speed.
RACQ spokeswoman Renee Smith said Brisbane-bound commuters on the Centenary Motorway travelled an average of 22km/h on their morning drive in March.
"Motorists need a road system that works and being more than 70km/h under the speed you should be driving at simply isn't good enough," she said in a statement on Thursday.
"It's not just the Centenary Motorway, we're seeing a bleak travel picture across the board."
Ms Smith said the RACQ figures showed some sections of the Ipswich Motorway were slowed by as much as 51km/h.
SOUTHEAST QUEENSLAND'S SLOWEST COMMUTES IN MARCH:
* Centenary Motorway - Brisbane-bound slowed by up to 72km/h in the morning
* Bruce Highway - Brisbane-bound slowed by up to 58 km/h in the morning
* Centenary Motorway - Leaving Brisbane slowed by up to 56 km/h in the afternoon
* Ipswich Motorway - Ipswich-bound slowed by up to 51 km/h in the afternoon