Right drive

For many years I've listened in silence my friends in 'the continent' critically refer to left hand side driving as yet another "yeah we're different just get on with it" attitude from the Brits.
There are many articles online proving it, and the bottom line is this: left hand side driving is how it all got started!
The arguments given here are pretty convincing:

In the past, almost everybody traveled on the left side of the road because that was the most sensible option for feudal, violent societies. Since most people are right-handed, swordsmen preferred to keep to the left in order to have their right arm nearer to an opponent and their scabbard further from him. Moreover, it reduced the chance of the scabbard (worn on the left) hitting other people.

Furthermore, a right-handed person finds it easier to mount a horse from the left side of the horse, and it would be very difficult to do otherwise if wearing a sword (which would be worn on the left). It is safer to mount and dismount towards the side of the road, rather than in the middle of traffic, so if one mounts on the left, then the horse should be ridden on the left side of the road.

The change to right hand side driving is also explained:

In the late 1700s, however, teamsters in France and the United States began hauling farm products in big wagons pulled by several pairs of horses. These wagons had no driver's seat; instead the driver sat on the left rear horse, so he could keep his right arm free to lash the team. Since he was sitting on the left, he naturally wanted everybody to pass on the left so he could look down and make sure he kept clear of the oncoming wagon's wheels. Therefore he kept to the right side of the road.

In addition, the French Revolution of 1789 gave a huge impetus to right-hand travel in Europe. The fact is, before the Revolution, the aristocracy traveled on the left of the road, forcing the peasantry over to the right, but after the storming of the Bastille and the subsequent events, aristocrats preferred to keep a low profile and joined the peasants on the right.

It was surprising to find out that in Portugal, from where I hear the harshest accusations ;), people drove on the left until 1928 (!) Sweden only changed in 1967.

Tom Waits says it best: I'm so thankful for these friends I do receive". But maybe, just maybe, the 'Brits' have it right this time.