One week after a truck wrecked the front of a historic midtown building, some residents and business owners are saying they'd like a traffic signal for what they say is a dangerous intersection. Several people sitting at Harry's Cafe, a popular sidewalk cafe next door to the damaged building, narrowly escaped serious injury when an Icee truck and an SUV collided at 16th and U Streets and ran up onto the sidewalk. Locals say last Tuesday's accident was one of many that have threatened people visiting businesses or on foot on the busy one-way street. "It's dangerous. I really want to see the city put a stoplight right there," said the cafe's owner, Harry Luong, 53. However, police acciden