Neither rain nor snow nor, apparently, traffic lawswill keep the Post Office from its appointed rounds.

The notorious East Cleveland traffic cameras nabbed U.S. Postal Service Vehicles breaking the law seven times and sent a notice to the Post Office on Broadway with the bad news every driver hates to see: a picture of the infraction and a demand for payment.

The check, though, is not in the mail.

Jennifer Breslin, senior litigation counsel for the Postal Service, sent East Cleveland a letter, instead, invoking the U.S. Constitution as an excuse for not paying up.

“In providing mail service across the country, the Postal Service attempts to work within local and state laws and regulations, when feasible,” Breslin wrote in response to a summons for payment. The letter was posted on the Web site Buzzfeed.com.

(Oh, by the way, try using the "when feasible" line if a police officer ever stops you for speeding and then give Tipoff a call and tell us how that worked out for you.)

“However, as you are probably aware, the Postal Service enjoys federal immunity from state and local regulation,” Breslin wrote.

“The Postal Service requires its employees to obey all traffic laws and rules while operating Postal Service vehicles. However, the state and/or local ordinances imposing penalties and fines cannot be enforced as against the Postal Service.”

East Cleveland Mayor Gary Norton said he was flummoxed.

“I was unaware that the Post Office doesn’t have to stop at red lights or obey the speed limit,” he said. “But since they are, I wish I’d get my mail faster.”

Norton said if an individual driving a mail vehicle was stopped by a police officer, the individual would be responsible.

He wonders why the post office dodged instead of giving up the culprits.

“RTA is a prime example. RTA makes the driver responsible for the citation pay it,” he said.