'540ing' a roundabout to save time

[ukaskew]

Picture the scene...

Two lane carriageway leads up to a roundabout where in the am rush hour 90% of cars will turn left. A bit further along the road after the left turn traffic can build up now and again because of a right-hand turning into a residential area, this backs up traffic in the left lane of the two lane carriageway for a bit, but the right hand lane is always fairly clear.

There are no filter lanes or anything at the roundabout, left lane is left, right is right (3 exit roundabout so no straight on), traffic starts to build up a bit for those in the left lane turning left, so some cars will shoot up the right hand lane, 540 the roundabout and more often than not will have to stop somewhere on the roundabout as the exit isn't clear. They will probably 'overtake' 10-15 cars, but as there isn't actually a traffic issue aside from this the overall gain is probably a few seconds by the time you've headed off further down the road (this is Wiltshire, hardly bumper to bumper traffic!)

I've had a fair bit of time to study this, on a good day with nobody 540ing the queue quickly dissipates, on a bad day more and more will start 540ing, which very quickly has a knock on effect that clogs the whole roundabout up and brings all directions to a standstill.

540ers, ok or not? Presumably nothing legally stopping them (although a question mark on blocking the roundabout), but in my opinion pretty bad form, a very small gain that seemingly blocks traffic for other drivers who would otherwise have no issues at that roundabout.

[ukaskew]

To clarify, I did indeed mean 450 degrees in terms of how I was thinking about it, or 15 hours around the clock (6 through 9, 12, 3, 6, then exit at 9), or one complete circuit of the roundabout + one junction.