That is beside the point; people posted it to send a not so subliminal message.
1) Our toll gantries are constructed on highways on top of fairly large concrete foundations.
2) The metal is very thick and there are many legs to the gantries - on both sides of a busy highway.
3) There is no power source nearby so a generator or gas powered cutting blade would be needed.
4) It would take several hours and several blades to complete the cutting work.
5) You can be assured that such a cutting process would generate a fair amount of sparks, dust and noise. This would draw prompt attention.
6) The cameras on the gantries are already operational as well as the security cameras.
7) Once power is lost on a gantry a team would no doubt be dispatched promptly as well, SANRAL is probably well aware of the threat.
8) Any sabotage to a gantry will result in fairly serious criminal and civil penalties.
9) We should not be seen to be promoting vandalism in any way shape or form as this only undermines our own cause.
10) Criminals and metal thieves do not usually scan facebook or e-mails looking for places to rob, they just use their own eyes.
ergo... chances of this actually happening to a Toll Gantry in SA? Almost zero.
If it was a possibility, then you would see a lot more signage and steel being stolen along highways.