Police in Wiltshire have been cracking down on vehicles illegally drving across Salisbury Plain.
The Plain is used by the Ministry of Defence as a training area, and Wiltshire Police and the MOD have been out in force over the last few weeks.
Vehicle checks allowed authorities to issue eight people with fines and seize three motorcycles for being used without insurance or a licence.
Sergeant Mark Venning, the MOD Police senior officer for Salisbury Plain said: "The vast majority of Salisbury Plain is owned by the MOD and it is regularly used for military exercises.
"This is an operational military training environment so this clearly presents a safety issue, but there is also the fact that 20,000 hectares of grassland on the Plain have been designated a Site of Special Scientific Interest and a Special Area of Conservation.
"We have had reports that damage has been caused to this environment by these unauthorised vehicles and motorbikes driving across the grasslands and in the woods."
Anyone with information about illegal activity on Salisbury Plain should call Plainwatch on 01980 674700.