On my way to work I have to cross a bridge. After you exit the bridge you have two choices - go straight and into town and beyond, or take a right and enter the major roadway to go in the other two directions. Most people will want to enter the major roadway. This roadway entrance isn't set up so well - basically it is a giant circle. You want to go south then you take the right and merge, you want to go north you take the right, make sure noone who is currently going south wants to turn around/go onto the bridge/the city (they have the right of way to merge in front of you) then keep going and make a partial circuit and then merge into traffic. It's a pain and there are accidents on there many many times. I need to go south but I would rather take the extra five minutes of driving through town and merge at a better point then take that first right. On the other side of the road you have the option of going straight to cross the bridge or turning right to start on the the set of turns to go north or south - with north being the first right and south being the one halfway through the circle.
Today I am going straight and the person in front of me decides he wants to go north - so he makes a left hand turn across two lanes of traffic so he can use the other side's entrance ramp.