Why are the steering wheels of English cars on the right-hand side?

The term left-hand traffic refers to road traffic which, in contrast to right-hand traffic, keeps to the left side of the road seen from the driver's perspective. Left-hand traffic countries are mainly those formerly governed by Britain. There are many theories and explanations for this way of traffic routing.

For example, it is assumed that right- or left-handed people determined the respective standards. Some believe, among other things, that this way of driving, which seems unusual to us German right-hand drivers, originates from the days when we travelled the roads in horse-drawn carriages. In those days, the reins were held on the left, right or in the middle or the vehicle was steered with the left or right hand.

Although this may seem arbitrary, there is no need to worry; a change from right-hand to left-hand traffic is very complex and, therefore no longer feasible.



Further information:
http://en.wikipedia.org/wiki/Right-_and_left-hand_traffic