The South Australian Transport Department is looking for a little bit more data before releasing its report into speed limits on country roads.

Department officials say extra submissions from regional councils are delaying the release of an inquiry into the 110 kilometre per hour speed limit.

The high upper limit has been the subject of some controversy and several changes in recent years, with the next report hoped to bring some concrete results.

South Australia has been modifying various speed limits to try to cut its road death toll.

The Transport Department’s review of 110km/h rural speed limits was due by the end of 2013, as part of the Road Safety Strategy 2020 plan

The plan aims for a 30 per cent cut in road casualties by 2020.

The department says it expects the results will be given to the Minister for Road Safety soon, but that some late submissions have delayed the completion.

The 110km/h rural speed limits being reviewed cover more than 5,500 kilometres of arterial country roads, not national highways.

The report will investigate issues of road alignment, roadside hazards and review casualties and crashes.