Which is the inside lane?

Answer 1

A phrase that is open to interpretation. In traffic accident investigation the 'inside lane' is usually the lane closest to the center line or median. But in common usage one must be careful to determine what the person asking the question means.

Answer 2

It depends on the local direction of traffic flow. In the United States and other countries where traffic keeps to the right, the inside lane would be the one closest to oncoming traffic, i.e., the leftmost lane of a multi-lane road.

In the UK, the 'inside' and 'outside' definitions are the opposite of the US. The inside lane is the lane closest to the edge of the road and the outside lane is the lane closest to the centre.