Driveway Motion Sensors:
These Driveway Patrol Sensor and Receiver Kits are motion sensors that wirelessly send a signal to the indoor receiver which rings a doorbell type chime. These can be placed at the entrances to driveways and walkways, or anywhere else around your perimeter that you want to be notified if someone is present. You can mask off the eye and camouflage paint the box so that it isn’t as noticeable.
If you need to deny vehicle access to an area use a chainsaw to bring down a tree across the road. Look for trees now that you can use in the future should you ever need to. Of course you need to keep in mind that any vehicles on the inside of where the tree falls will be trapped.
An alternative vehicle denial method might be to string a heavy-duty steel cable between trees across the road. Be sure to hang “no trespassing” or similar signs and orange safety ribbon so that no one accidentally drives into the cable. When secured with a padlock it will be easy to deny or grant vehicle access as necessary.