Then there're the crossroads that use a variation on this system. Imagine a roundabout with one of the major carriageways cutting across the centre of the roundabout. To make the turn across traffic you can either make the direct turn or you can cross the continuous carriageway into the half circle, do the half loop, and wait there to make your turn. There have to be traffic lights in busy areas for this system to work at all. The lights limit the space for queing. The result is cars pointing in every direction waiting for lights to change. As soon as the green shows the traffic that has been stranded and the traffic waiting their first attempt to negotiate the junction both get the opportunity to move. The ensuing meleé is a treat to drive in.
My favourite though is the on and off motorway junction. Picture a three lane motorway. Where the incoming slip road joins the motorway a fourth lane is added for a while. The fourth lane runs parallel to the motorway and ends at the off slip. So traffic moving on to the motorway fights for space on the fourth lane with traffic turning off the motorway. 120kph dodgem cars with vehicles necessarily cutting each other up in order to gain the safety of their continuing carriageway.
The endless variety of bizarre systems is a pleasure to behold.