The M8 through Glasgow has been named the worst route in Britain for congestion, ahead of cities such as London and Manchester.
The M8 topped the poll ahead of routes in London and Manchester.
A survey by the traffic information service Keepmoving found drivers using the motorway eastbound were the most likely to encounter delays.
Researchers measured the speed of cars during both the morning and evening rush hour during April.
It found drivers faced an 85% chance of being stuck in queues at peak times.
Roads around London, Birmingham, Manchester and Glasgow were looked at during the month of April.
The survey measured the speed of cars at three minute intervals between the rush hours of 7.30am to 8.30am and 5pm and 6pm to calculate the percentage time drivers were stuck in traffic jams.
Five stretches of road on the M8 featured among the worst spots for congestion in the UK, with delays most likely at junction 16 Cowcaddens and at junction 20 on the Kingston Bridge.
Alex Petrie, product director of Keepmoving, said the issue of road pricing was brought into sharp focus by the study.
He said: "Our research highlights the exasperation felt by long-suffering commuters in Glasgow, where the M8 causes chronic delays.
"The debate over road pricing becomes even more pressing if you consider the amount of time and money drivers waste in traffic."
Last week it was revealed that motorists travelling between Glasgow and Edinburgh on the M8 could take longer to reach their destination than those diverting an extra 25 miles through Falkirk.
Researchers found that commuters could save up to one hour per week using the alternative route.
Neil Greig of the IAM Motoring Trust said that the study confirmed that the M8 was unable to cope with the volume of traffic at peak times.