When both cars are turning right at an uncontrolled intersection (which includes many driveways and entrances to public car parks that don't have markings), you must give way to vehicles on the straight road (i.e. the top of the T). The blue car has right of way - the red car must wait for you to turn.


Even though you have a green light, so does the red car, and it is heading straight through the intersection while you want to turn, therefore you have to wait.


You both have a green light, but because you are turning left you can go first.


You both have a green light but the motorbike is turning left, therefore you must wait for it before you can turn.


In this scenario neither car needs to cross each other's path. Both are on a green light. If this was an uncontrolled intersection this manoeuvre is actually safer when the cars pass behind one another rather than in front. This is because when passing like in the diagram, your vision up the road to the left is obscured.


On a roundabout you always give way to the right, so you have to wait for the red car.


The red car must give way to you as you are coming from its right, passing straight through the roundabout.


In this case you are deviating from the centre line, even though you want to drive straight ahead. The red car has right of way.


Both of you can complete your manoeuvre without interfering with each other's trajectories.