Since penning a piece on the failure of too many drivers to ‘Keep Left Unless Overtaking’, particularly on motorways, I've received quite a few emails. The great majority are in complete agreement with my words. With many replies saying that if the police spent more time enforcing this law instead of simply sitting behind speed cameras life would be safer and more relaxed on the road.

Two things did crop up that worried me, though. Firstly some drivers said they preferred not to drive in the left lane because they weren’t confident of moving out of that lane when other vehicles came onto the motorway.

To any driver who isn’t confident in changing lanes may I make the following suggestions? Either arrange for some driving lessons from a professional driving trainer, or turn in your driver’s licence and sell the car.

Harsh words? No, because in our increasingly crowded roads anyone who can’t blend and move their vehicle in co-operation with other road users is potentially dangerous. Not to mention the fact that they slow the traffic flow for everyone.

I feel it's a reasonable assumption that a driver who isn’t able to change lanes precisely and safely at a few second’s notice is unlikely to be able to carry out more complex driving manoeuvres. Things like suddenly swerving while simultaneously braking and or accelerating to avoid a crash caused by some else’s mistake – or their own.

OK, in an ideal world no one would ever have to swerve their vehicle – but we don’t live in an ideal world.

Maybe you could avoid extra driving lessons or giving up driving by being unsure about changing lanes. One reason for lack of confidence is poor adjustment of door mirrors. These mirrors are there to fill in the blind spots on both sides of the car, not to duplicate what you can already see in the inside mirror. If you can see the back corners of your car in the door mirrors they are almost certainly not set wide enough. And don’t worry about not being able to see the back corners, they aren’t going anywhere.

Well, let's hope not, because bad lane changing may see these back corners being rearranged in a very unsightly manner.

The other thing that worried me in this ongoing Keep Left ... correspondence was the realisation that some drivers aren’t willing to merge correctly when getting onto motorways or during lane changing. It's not as common as it used to be, but the worrying habit of Australian drivers demanding their territorial rights on the road is still alive and well.

Too often drivers speed up when they see another car wants to move in front of theirs. A dangerous practice, not only at the moment it occurs, but for some time afterwards as the resulting rise in blood pressure doesn’t do any good for either party.