Plans have been drawn up to increase the current £60 penalty to £100 in areas where parking is controlled by local authorities. This includes Edinburgh, Glasgow, Aberdeen, Dundee and Perth.
Council bosses claim the need the extra cash to offset soaring parking attendant salaries and to deter drivers from contravening regulations.
Holyrood ministers are backing the controversial idea and set out their support for the increase in a consultation document prepared by the Scottish Government's transport directorate. It states: 'The Scottish ministers' goal of local authorities operating self-financing parking operations is becoming less realistic as the cost of parking enforcement rises. Against that scenario ministers now propose issuing revised guidance allowing participating local authorities the option to introduce two higher rates of penalty charge notice - £80 (discounted to £40 if paid within 14 days) and £100 (discounted to £50 if paid within 14 days).
The consultation is due to close in June after which ministers will decide whether to rubber stamp the plan.
Motoring groups described the proposed fine increases out 'outrageous' and warned of a backlash from long-suffering drivers.
Under decriminalised parking law, introduced in Scotland in 1997, local authorities took over the administration of most parking regulations previously handled by police traffic wardens.
Income from fines is a significant source of revenue for councils. This year Aberdeen, Dundee, Edinburgh and Glasgow expect to rake in at least £14.1 million from penalties.
The consultation document states 'Staff salaries have increased 50% since 2001'. A salary increase of 50% in 9 years? Don't anyone dare tell me that those working in the public sector aren't well paid. This will become law as the Scottish Government support the action. Just make sure that if you ever park in any of these council areas, your car is between parking lines and not on them. A friend recently was given a £60 penalty notice in Edinburgh because her back wheels were on the line not inside it.