Tom Rose, of Poulsbo, Washington, received a nasty surprise in the mail recently, when he was billed an eye-popping $18,000 -- in toll fees!

Rose's son had been crossing the 520 bridge daily on his work commute, but failed to obtain a Good To Go pass to cover the mounting fees.

The son says he expected to be billed for the fees, but, to his knowledge, never was.

Rose was enlightened to the situation when he tried to sell his car, and was met with the invoice for $1,360 in tolls and over $16,000 in penalties -- presumably for non-payment.

The department claims they did indeed send a bill, but the letters were returned.

A lawyer has now filed a class-action lawsuit regarding the department's policies and procedures.