The gardai paid a speed-camera operator 14.6 million euro last year - but took in less than 7.2 million in fines as a result.
GoSafe has high-viz vans throughout the country, acting on the gardai's behalf to make roads safer.
They've been employed since 2010 to check drivers' speeds.
Sinn Féin's justice spokesman, Martin Kenny, says the contract is not good value for money.
Wicklow Surgeon Honoured By Tallaght University Hospital
Extra Lifeguards Deployed With Extended Hours On Wicklow Beaches This Week
Bus Service Boost For Wicklow with Connections to Carlow & Kilkenny
Greystones Man Given Suspended Sentence Following Sustained Campaign Of Abuse
Appeal for Information As Rathdrum Man Reported Missing