UNAUTHORISED off-road bikers are being warned off Tickhill Quarry near Dilhorne.
Police are warning they now have the powers to seize machines from offenders.
It follows the introduction of a Section 59 order at the site after complaints about noise.
The quarry hosts organised 4-4 vehicle events (pictured) but unauthorised off-road biking is forbidden.
Anyone who has a scrambler bike seized faces having to pay £150 to reclaim it.