Simply put, the barrier will stay up until all deer have vacated the area. Vehicles will not activate the system due to electro-magnetic detection devices buried below ground on either side of the motion sensors. The driveway stays open for all vehicles to pass, but if a person happens to walk by and activate the barrier, there is a mechanical override button that easily re-opens the entrance. Motion sensor close-up. The above picture demonstrates the main attraction of the system - how inconspicuous it is.
Nothing crosses the driveway other than the barrier when it is deployed.
This system is designed to be extremely safe. A safety feature is also built in that immediately shuts down the sliding barrier should a person somehow get in front of the device during deployment. The light remains off whenever the system is armed. Deer will learn to enter through these openings, and this will make training them later even more difficult. Because they are creatures of habit, deer will instinctively follow the fence line and enter through the driveway, then become trapped inside the enclosure.