Well Racedo...I must be EXTREMELY fortunate....There were in the old troubles days NUMEROUS checks....and usually in the vicinity of class C roads. Since 1986 ....with the exception of the foot and mouth crisis...I have NEVER ...EVER ....been checked. My missus regularly transits DUB from CLE with not a sideways glance(excepting when she recieved her Indefinite Leave to Remain in the UK and showed it to the ROI border guy in DUB....he just looked askance and said have a nice day)
Whilst it may be happening..in MY experience .....it is as rare as a hens tooth.
The germane portion of your cut and paste section is
and
Justice Minister Dermot Ahern and British home secretary Jacqui Smith confirmed they have "no plans to introduce fixed controls on either side of the Irish land border for immigration or other purposes".
Any ways ...happy travelling