RCMP say a man is dead after a two-vehicle collision on a New Brunswick highway.     Police say the collision happened around 1:30 p.m. today when a car travelling northbound on Highway 11 near St. Margarets lost control and collided with a southbound pickup truck.     They say the victim, the sole occupant of the car, died at the scene.     Police say the man and woman who were travelling in the truck were taken to hospital with non-life-threatening injuries.     The cause of the crash is under investigation.