There are three scenarios where it is necessary to apply a [[Junction Box|Junction Box]] over a [[Roundabout]] (JuBra):
# Exit options (TRs) must be set to red on the roundabout because the roundabout is built in such a way that driving all the way around is not allowed.
# The roundabout must give appropriate instructions (turn right, straight ahead or left over the roundabout) in order to be able to use the directions from the signs at the roundabout.
# For an exit segment, depending on which side you approach the roundabout, you have to work with different direction names.