any good method that doesn't involve vandalism?

i was in china before and they have a very neat way that i think will be effective. just not sure if i can do it here without kena saman

basically they have a metal thing fixed to the road. if you close it, it will look like a long piece of metal lying on the road

but if you expand it, it will look like a triangle. You can use a lock to fix the triangle position. and when you want to park, just unlock it to make it flat

so if you expand it, unless someone so crazy enuf willing to let their car kena scratch, or else will deter them

question is. will majlis perbandaran guys really take action if i make those things or they will close 1 eye?