Eight Garda cars were rammed in Cavan and Monaghan last year.
A number of Gardai were injured and off duty as a result of the incidents.
Six of the cases last year were recorded in the Carrickmacross District, which was described as a “blackspot” for these incidents.
Chief Superintendent John O’Reilly said suspects in these cases often use Northern Ireland as a way to escape pursuit.
Despite co-operation with the PSNI and “some success” is catching those involved, Chief Superintendent O’Reilly said when a car “breaks for the border”, it can “go to ground”, carry false number plates or it may never be seen on the road again.
There was one incident each in the Monaghan and Cavan districts.
Some the incidents across the region were described as serious, with members of the Gardai injured and off duty for a period of time.