I beg to differ.
if you talking about old folks, I think we need to discount given
their age, they aren't as agile or alert. I have seen old couples
in typical small car, hogging the right lane, cause 100m away, they
are turning right.
To me, they prefer to be safe.
As for big cars, one thing, they do take up space, and a slight
deviation to left/right, means they may come closer to nearby cars.
So exercise caution.
As for not turning on signal lights when turning, this is a major
diseases infecting 95% of all sng drivers lah. All drivers expect
other drivers to have ESP, (inbuilt psychic ability )to know when
and where the front driver turning.
To date, I think that the rule "if you hit something infront you
are wrong " is not longer applicable due to these reckless and
inconsiderate drivers, esp those faulty taxi drivers.