Non-PRO French to English Other General / Conversation / Greetings / Letters

From a lease agreement.
This is something a building tenant can install in their parking area if they want.

I can't find a direct definition of this, but based on my google images search, it seems to be possibly one of those bike racks with U-shaped arches, or maybe some sort of loop that is itself the lock?

"Un projet de signalisation et d'installation d'***arceaux cadenassés*** sur les emplacements devra être soumis au bailleur par le preneur pour validation."