A St. Petersburg man was killed on Friday after he was hit by a vehicle trying to cross a Pinellas County highway, authorities said.According to a Florida Highway Patrol report, a Nissan Versa, driven by a 44-year-old Indian Harbor Beach man, was traveling westbound on Ulmerton Road at about 10:15 p.m.At the intersection of County Road 611, the driver had a green light and continued through the intersection, where he hit the 60-year-old St. Petersburg pedestrian who was crossing the highway in a crosswalk.The pedestrian suffered fatal injuries at the scene of the crash.