Bus commuters say their travel times have not changed since the Hills M2 upgrade was finished despite better public transport used as a key justification for the project.

After enduring two years of clogged traffic while construction was underway, some bus users say they have lost out while motorists reap the benefits of the widening of the tollway between the Hills district and Lane Cove.

Marc and Rebecca Neal are among passengers whose journey to the city takes longer since the Hills M2 Motorway upgrade was completed. Credit:Peter Rae

Transurban, which has a contract to operate the road until 2048, has boosted its toll revenue by almost 40 per cent over the past financial year with the M2 raking in $221 million, a 14 per cent increase on previous year.

A Hillsbus spokesman confirmed that due to an increase in bus use and traffic on the motorway, bus travel times during the morning peak were "slightly" higher than they were before the upgrade. On one route the travel time had increased by five minutes, he said.