As reported by Jason Sickles, Yahoo!
Postal Service says it’s immune from local traffic laws
...Postal Service attorney Jennifer S. Breslin says two school-zone speeding citations and five red-light infractions by postal trucks in December should be ignored...
“However, as you are probably aware, the Postal Service enjoys federal immunity from state and local regulation,” she continued.
Even the Post Office thinks their employees are above the common American.