As taxis are exempt from car seat laws, you can rarely find an appropriate car seat in the back seat of these vehicles. But, of course, you can always use your own car seats in the vehicles. For this reason, you should rent a car with a seat for your baby as a safer and more convenient option. However, when a car seat is unavailable in a licensed private hire car or taxi, a child might travel unrestrained in the rear. This is the only exception for all kids under three years of age. Such a law was approved for practical reasons rather than safety standards.