In Hagenberg, Upper Austria, there is a security gate that should prevent external people from entering the student village's premises. This picture is taken from Google Maps and shows how easily this security measure can be circumvented.
Actually, there are parking lots near the gate and right near the entrance of the first building there is enough space for a car to bypass the security gate.
I guess, even one little, heavy plant placed on the by-pass road would prevent the people from using this route. Most of the time, people could close security loopholes by spending none or little money. They just need a little help to find their vulnerabilities.
i wonder if it actually would make sense to spend money on closing this loophole. as soon as parking lots get rare (students come in), the hole is automatically closed by parking cars, thus preventing unauthorized persons from driving in and blocking additional space. and if there are enough free parking lots (e.g. during summer breaks), no one cares if someone unauthorized parks inside ;-) but in the end i guess you are right. you have some sort of control that does not work properly ;-) though the risk seems quite low.
I agree, the risk is quite low, but it seems that this issue occurs more often that one might think. Even today, I discovered a similar loophole for the underground parking lots of the university. Pretty much the same kind of problem, and in this situation you have to pay per month to get access to it. Perhaps I can take some pictures, next time.
The solution could be the same as above, or the introduction of staff stickers in cars. They would not prevent someone from parking, but the one who don't pay would be discovered much more easily.