a car is stopped at a 4 exit roundabout today in the right hand lane which is marked right and another is in the left which is marked left side by side 1st exit to the left is two lanes wide the 2nd exit straight ahead is a single width road going up a lane and the 3rd exit right is a dual carriageway also.so the car in the right hand lane drives toward the roundabout indicates left to go into the outside lane of the dual carriageway and the driver in the left hand lane decides to go straight on across the roundabout into the lane with no indication