Can You Judge a Society By Its Traffic Flow?

I used to live in South Australia. The drivers of South Australia were known for their courtesy to other drivers. Sydney has a very poor reputation for driver courtesy. In Los Angeles apparently you can be shot for using an indicator to change lanes! South Australians are no longer revered for their manners on the road.

I was wondering about how a society is viewed by others by looking at its traffic flow. Society is much more pleasant if drivers let other drivers move in front.

Are we more pleasant people in Perth?
Or is it just that we are letting women in front which shows a bit of desparation/flirting?

I think that someone needs to conduct a study about this.