Either she (yes, it's a lady driver cos later on at a junction, she got out to inspect her car) made a boo boo and wanted to do a lane change in a junction and assumed the other car was going to turn right (even thought the right most lane is a go-straight/turn-right lane)
or she was making an even bigger boo boo by wanting to turn right when she was not supposed to in the first place.
Either case, we can do with less of such drivers on the roads
https://www.youtube.com/watch?v=NA18AjmdRf8&feature=youtu.be
Note: I realised I had typed the wrong car plate in the post's title (should be SDR7377P, not SGR7737P). Anyone can advise how I can get that corrected?