Неверно.
Водители везли на свой страх и риск, или же не знают о законе (в чём я сомневаюсь):
Rear-facing child safety seats
Your baby must be in a rear-facing seat that is correct for her weight and height when in a vehicle. It is the law in Alberta. It is safest for a baby to stay rear-facing until at least 1 year old, at least 22 lbs (10 kg) and walking. You should not rush to put your child in a forward-facing seat. The rear-facing position is the safest, and many child safety seats allow children to stay rear-facing longer.
Forward-facing child safety seats
When your child is at least 1 year old, at least 22 lbs (10 kg), and walking, your child can use a forward-facing seat. Keep your child in a forward facing seat correct for his height and weight until he is at least 40 lbs (18 kg) or until he is at least 6 years old. It’s the law in Alberta. Some forward-facing seats may be used with the 5 point harness up to 65 lbs (30 kg).
Booster seats
When your child has outgrown her forward-facing child safety seat she can use a booster seat. Children who are under 9 years old and have outgrown their forward-facing seat, who weigh between 40 and 80 lbs (18-36 kg) or are less than 4’ 9” (145 cm) tall are safest traveling in a booster seat. An adult seat belt alone does not properly fit a child’s body – it rides too high on the belly and neck and can cause serious internal injuries in the event of a crash. A booster seat helps the seat belt safely fit a child’s body.
А здесь можно подробно почитать о требованиях закона на тему безопасности детей (конкретно, критерии для детских кресел):
<noindex>http://www.tc.gc.ca/eng/roadsafety/safedri...stages-1083.htm</noindex>
Закон есть закон, но у нас таксисты ничего этого ни разу не требовали. Для младшего у нас для такси всегда было сиденье. У нас с женой в каждой из наших машин есть booster seat для одного ребёнка и car seat для другого.