Down here in the South East, a habit seems to have developed where drivers stop to let other drivers out of a side road onto the main road. This is very courteous, and makes sense if you're in a queue of slow-moving traffic on the main road. However, this courtesy seems to have gone mad, with drivers on clear roads stopping to let others onto the road. A driving instructor once told me that if you did this in a test, you would be failed.

I feel that this will eventually lead to confusion on the roads, with people pulling out of side roads expecting other drivers to stop, to let them onto the main road. Do I have a genuine reason for my anger about this behaviour, or am I just a very rude driver?