When the speeding bus misses one turn in the city because of a group of school kids, it approaches a building site where it has to turn to the right, a really 'ugly' turn that is. Mr Reeves asks the passengers to move to one side of the bus.

When the bus arrives to the turn, Ms Bullock turns the right winker on (clearly visible inside, next to the steering wheel) and then you can see the flashing arrow. It's pointing to the right on the screen, therefore it must be on the left side of the bus, actually.