More than 50 police officers were fined for speeding in the Avon and Somerset force area last year while not on an emergency call, according to a BBC news report.
In figures obtained through the Freedom of Information Act, police vehicles are shown to have triggered speed cameras 640 times.
In almost nine out of ten cases, the penalty was cancelled, but officers were fined in the remaining cases.
In a statement, the force put some of the speed camera activations down to members of other constabularies passing through the area.
But it said: "The high number of Notices of Intended Prosecution in Avon and Somerset Constabulary may relate to the fact we use strobe lights rather than revolving blue lights which are not always picked up by the safety cameras.
"We would stress that we are an open and accountable force and will prosecute officers when they are unable to demonstrate their actions were for a lawful policing purpose.
"If officers are prosecuted they can be put through a refresher course on the force's driver training programme."
The statement added that the vast majority of police drivers were highly skilled and operated within the law.
It also urged the figures to be put into context: officers responded to nearly 50,000 call-outs last year.
Paul Smith, founder of the Safe Speed road safety campaign said: "These figures will do nothing to reassure the public that they are being treated equally and fairly. The perception that Police officers are given considerable latitude, while members of the public receive none at all will persist.
The only solution is to afford the public the same level of discretion that the police receive."
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