
I'm sure it does make a difference. Even a large number of those dropping children off on the way to walk will not have the good fortune of having the school exactly on their route so the total length of time that everyone is on the road is reduced.
I notice this term our local primary has reintroduced their failed walking bus scheme and this seems to be having an effect on the traffic around here. There seems to be a lot more children in it than the last effort so hopefully the parents have finally woken up and decided to support it :)