Ive used taxis before without a child restraint when I only had the one. Meh it didn't bother me.
The rule is like that to help tourists and ppl who suddenly don't have their cars for whatever reason or who can't drive.
I've done the SAHM thing with 1, 2 and next year 3 kids with no car.
Emergencies - call an ambulance. Otherwise it's a walking/public transport thing if you do not want to use taxis.
You can't use taxis if you have more than one child per adult. So that excludes me on all accounts now.
wifey of hubby who is always away. mother of two girls who are always amusing.