An accident on Monday involving a vehicle and bicycle resulted in a 13-year-old Sturgeon Bay boy being taken to the hospital with suspected serious injuries.   According to the police report, at about 4:30 pm, a pickup truck driven by a 47-year-old Sturgeon Bay man struck the boy on his bicycle that had improperly changed lanes while entering or exiting the roadway on South Neenah Avenue just south of Willow Drive.  The Sturgeon Bay Police Crash Report and witnesses indicated the bicyclist turned in front of the southbound truck, which the driver attempted to slam on his brakes before the collision.  Emergency Medical Services transported the boy to Door County Medical Center for treatment, where his condition was not released.  The pickup truck driver was not cited and was not impaired or under the influence.