This weekend, I spent a huge amount of time on various UK motorways. It struck me just how bad lane discipline is among motorists.

Between being frustrated by poor driving, I discovered those unable to make a textbook, Highway Code-correct lane change, broadly fall into four categories:

No indicators

The bread-and-butter of motorway frustrations. Want to change from lane two to lane three while saving the electricity destined for your yellow bulbs? No problem, just turn the wheel a few degrees and make your move. Generally happens when no other vehicles are particularly near.

The Drifter

No signal, and presumably no mirrors before making an indecisive manoeuvre. Are they just lolling from side to side in their lane, fiddling with the sat-nav? Are they changing lanes? Who could possibly tell?