THE SUNROOF EXPLODED OUT WHILE DRIVING ABOUT 45MPH. MOST OF THE GLASS EXITED THE VEHICLE ABOVE BUT MANY SHARDS OF SHARP GLASS SPRAYED ALL FOUR PASSENGERS. ALL FOUR PASSENGERS RECEIVED MINOR CUTS. NO ROCK OR OTHER FOREIGN OBJECT WAS OBSERVED IMPACTING THE VEHICLE. THE GLASS EXPLODED OUT NOT IN. THE OUTSIDE TEMPERATURE WAS ABOUT 7 DEGREES F. THIS OCCURRED ON HIGHWAY 99 BETWEEN WHISTLER BC AND SQUAMASH BC ON FEBRUARY 3, 2019.