SEE WIRE STORY-AM-BRIDGE-UNITY (XCB 101) BORDEN, PEI, May 30--BRIDGE RACE--A pack of 2500 runners head to P.E.I. from New Brunswick as they race across the Confederation Bridge over the Northumberland Strait on Friday. The race is a once-in-a-lifetime event as no pedestrian traffic will be permitted after the span opens to traffic on Saturday. (CP PHOTO) l997 (stf/Andrew Vaughan) av