The territory's speed cameras were broken for more than 13 per cent of their running time between March and February, with some of worst culprits among the five lowest-grossing cameras Canberra-wide.

The northbound fixed speed camera on Athllon Drive, between Drakeford Drive and Beasley Street, issued only six infringements notices in the past year, totalling $2118 in fines.

Its southbound counterpart performed only marginally better, registering 10 cars driving unsafely, and issued $2042 in fines.

A spokeswoman for Justice Minister Shane Rattenbury said this was partially because the two cameras were not working for a total of 146 days in the past year.

"[They] were shut down for a period due to extensive repairs being carried out following a motor vehicle accident," she said.

Further north, a camera at the intersection of Hindmarsh Drive and Yamba Drive was down for more than half of the past year while the government held a tender process to replace it.

The device was down for 189 days in the past year and recorded only 67 drivers behaving irresponsibly at the intersection, raising $19,415.

Also waiting to be replaced was a camera at the intersection of Hindmarsh Drive and Tuggeranong Parkway, which was down for 174 days in the past year but still registered 116 drivers breaking the law.

The spokeswoman said both cameras had since been replaced.

The fifth lowest-grossing camera in the ACT, found on the Monaro Highway near Hindmarsh Drive overpass, issued only 136 infringement notices but was largely operational, missing just nine days.

The spokeswoman said the purpose of speed cameras was to contribute to compliance with speed limits and reduce crash risk, rather than generate infringements.