Teenage Mutant Trainee Bangarda

Nothing too literary today, just a gripe about a bangarda at the Merrion Square/Clare st junction. The bus lane along Merrion Sq north comes to an end about 20m from the lights, and starts again about 20m after them on Clare St. There's a yellow box at the end of the buslane on Merrion Sq to allow buses and taxis take up position in the right hand lane which is marked with an arrow for straight on. The left hand lane (which was the bus lane) becomes the left-turn lane.
I was at this junction, but unable to get into the box for the straighton lane because some eejit was sitting in it, but there ahead of me in the left-turn lane was a bus, going straight on, who obviously hadn't been able to get into the box either. So I waited by the box, and when the lights changed and the bus moved across the junction into the bus lane beyond, I saw that I could do likewise, whereas the traffic in the straight on lane couldn't move because of gridlock, so I obviously couldn't get into the box to get into the straight on traffic. What to do? It's a no-brainer: get straight across by using the 20m of left-turn lane to reach the junction and sail across to the buslane.
Except a teenage mutant trainee bangarda jumps out in front of me and tries to force me to turn left.
-You're in the wrong lane! she screams at me triumphantly. -Go left!
-No. I've got clear passage across to the bus-lane, I said.
-You're in the wrong lane, she repeated. -You have to turn left.
-NO, I'm not going left. I'm going straight on. I'm a taxi and I was using the buslane, butI couldn't get into the box back there to get into the correct lane, I said. -There's somebody sitting on it.
-You're in the wrong lane, she repeated.
-Was the bus in front of me in the wrong lane? I asked.
-Alright, she relented. -It's the last time I'll let you off though.
During this exchange, the traffic in the right hand lane across the junction had moved on, but the traffic immediately beside me on my right was being held up from progressing across the junction by a white jeep with a Cork registration that was trying to turn right down a one-way street beside the Mont-Clare Hotel!