LOONIE ALERT If you do not have a good reason to go into Center City on Sunday - particulary between Penns Landing and Independence Mall - here's a simple word of advice for you: DON'T! An anti-war (or either "anti-Bush" or "anti-troops", depending on your points of view) demonstration is expected to tie up traffic along Market Street on Sunday afternoon, starting at around 2:00pm. Expect the R1 Airport shuttle buses and most surface routes along 2, 3, and Market Sts and the Penn's Landing area - 5, 9, 17, 21, 33, 38, 44, 48, and 57 - to be severely impacted. You can also expect the El to be very crowded within Center City during the height of the rally.