Answer: Parking IS for customers only. All other vehicles will be TOWED.
Explanation:
Two things are wrong with the above sentence being ARE and TOAD.
ARE is the wrong linking verb to be used in that sentence because Parking comes across being used singularly and Are should be used for plurals. IS is therefore the right one to use as in Parking IS for..., not Parking ARE for....
TOAD is the wrong spelling for TOWED which is the confiscation of vehicles deemed to be doing something illegal.
