A congestion charge originally forecast to bring in £320,000 a month instead raised more than £1m in January, figures show.
Oxfordshire County Council introduced the temporary £5 daily congestion charge on six roads in Oxford in October.
Council figures, show the majority of the £1.04m generated from the scheme in January came from fines issued to people who failed to pay the charge.
Overall, £757,435 came from penalty charges, while £287,205 was from those paying the charge.
That is compared to only £70 earned through fines in the scheme's first two months.
In total, the authority has generated £1.7m in income from the scheme since it started.
