Tender documents show the government recently awarded a $32,396 contract to security consulting firm Agilient for a series of security risk assessments of Canberra's bus interchanges and two depots.

Under the contract, the consultants will assess interchanges in Tuggeranong, Belconnen, the City, Woden, Gungahlin and Dickson as well as the depots in Belconnen and Tuggeranong.

Those assessments will include site visits and interviews with "relevant stakeholders to determine security risk impacts to the [transport] directorate's operations", leading to a wider report recommending improvements.

A government spokeswoman said while the national terrorism threat remained at "probable", there were no specific or credible threats prompting the investigation.

"People should continue to go about business as usual but be alert to any suspicious activity and, most importantly, to report suspicions and concerns to the appropriate authorities," she said.

She said the assessments were timely as the last formal security risk review of the ACT's bus stations was completed in 2015 and the national strategy to protect crowded places from terrorism, launched in August, would inform the assessment.

"The security risk assessments are part of the rolling program of [the directorate's] security risk assessments as mandated by the ACT protective security policy framework," she said.

Tender documents show the work will include focus on determining any potential security risks and other "impacts" relating to the eight sites, including consider threat scenarios, existing controls and security risk mitigation strategies.

The contractors will also report back to the government on a ';clear set of recommendations to mitigate" any identified security risks at each interchange or depot, though it is unclear if those recommendations will be released publicly.

While focussed on potential terrorism-related threats, the investigation will also include examining wider, less serious security risks linked to the interchanges, ranging from the risks of theft and vandalism to anti-social behaviour.

The government spokeswoman said the assessments complemented the new national strategy, "particularly assessing the effectiveness of protective security measures".

"All ACT government owners and operators of crowded places are using the strategy to identify opportunities to further enhance the safety of Canberra's public places," she said.

"The risk assessments incorporate the principles of the new national strategy for the protecting crowded places from terrorism."