Harsher penalties for speeding motorists are due to come into effect next week.
The guidelines will be used to sentence offenders in magistrates' courts across England and Wales from Monday April 24.
However, concern has been raised that there is a a declining number of dedicated road traffic police officers to deal with potential offenders.
The Sentencing Council has increased the penalty for the top band of seriousness with the aim of ensuring there is a clear increase in fine level as the seriousness of offending increases.
This means fines for these offenders will have a starting point of 150% of weekly income rather than the existing level of 100%.
The law sets maximum fines for speeding, so fines cannot exceed these. The maximum fine for speeding is £1000, unless it takes place on a motorway, in which case it is £2500.
Or if motorists are caught going between 31 and 40mph in a 30mph zone, they will get three penalty points and a fine of between 25 and 75% of the weekly income.
The Sentencing Council said the move to increase penalties aims to ensure there is a “clear increase in penalty as the seriousness of offending increases”.
It follows responses to a consultation arguing previous guidelines did not properly take into account the increase in potential harm that can result as speed above the limit rises.
RAC road safety spokesman, Pete Williams, welcomed the change on speeding.
He said: “Anyone who breaks the limit excessively is a danger to every other road user and is unnecessarily putting lives at risk.
“Hopefully, hitting these offenders harder in the pocket will make them think twice before doing it again in the future.
“While greater sentences for excessive speeders are obviously a deterrent, the best deterrent of all is more effective enforcement.”
Louise Ellman, chair of the Commons Transport Committee, welcomed the change regarding speeding penalties.
“However, for enforcement to be successful, there must be the likelihood that offenders will be caught and prosecuted,” she said.
She added a declining number of dedicated road traffic police officers is of “real concern”.
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