Over here in Ireland the Police (Gardai) generally drive either Ford, Opel or Toyota as patrol cars usually nothing smaller than a Mondeo or an Opel Vectra though. You rarely see very small Garda cars.

(And for anyone in the UK, we don't have Vauxhall in the Republic of Ireland for some reason but Right hand drive opels manufactured in Germany.. strange scenario something to do with Vauxhall being associated with rust)

For traffic patrols they've a few unmarked suped up high end opel omegas and volvos mostly along with some pretty powerful 4x4s like jeeps, rangerovers etc.

[Linked Image from garda.ie]

Images from www.garda.ie