i took this instructable down for a few months because my sign hacking incident made it into the local paper and i had to lay low for a while, so i guess you have a good example of the riskiness of pulling this off.
if you are able to pull this off, i am entirely responsible. feel free to include my name in your court case.
but honestly, I'm just sharing this for scientific purposes not vandalism.
i was inspired to do this because of the i-hacked article but this turned out to be totally different to the device i encountered, so after getting it to work i felt compelled to share how i got it to work.
so, lets get started shall we!
if you are going to attempt this you are going to want some tools capable of "conquering" a padlock.
might i recommend a crowbar. but pack lightly as some evasive running may be in order if someone should come to investigate the scene.
these signs aren't hard to locate, just search for areas like traffic zones or roadworks areas. once found it would be best to park some distance form the scene to keep your getaway vehicle less obvious.
open the keypad faceplate using the black knob shown in the first picture, you will end up with some computery-looking stuff in fount of you. once in the computery space you will see a small black/grey box with loads of antenna cable coming out of it, as a precaution; rip it out or with it with your crowbar. not sure what it dose but transmitting anything cant be a good thing.
you have now broken in entry as well as committed vandalism, don't tell your mother.