The agreement is between two (or more) parties agreeing to the agreement. The placard is not.
In regards to any agreement, you can choose to not agree and thus are not bound by the agreement.
1.2. How do I accept this agreement? By using or accessing the Services, or by agreeing to these terms where the option is made available to you in the user interface, you agree to abide by this Agreement without modification by you. If you don't agree, you may not use the Services.