The Ontario government is planning legislation and regulation that would make booster seats mandatory for pre-school to primary-grade-aged children weighing between 18 kg and 36 kg (40 lbs. to 80 lbs.), with a standing height of less than 145 cm or maximum age of eight years. The bill is currently being considered, and if passed later this year, will likely come into effect in the spring of 2005.
Safe Kids Canada recently launched the 2004 Safe Kids campaign Age 4 to 9? It's Booster Seat Time! and have called for similar booster seat legislation across the country.