It’s a deadlock situation and can arise without any screw ups. Imagine the buses being 5x as long and all reach the intersection at the same time as an example. All have space to enter the roundabout but they’ll reach the same situation as in the picture.
To fix this people uses signals and can be done by having the buses follow “Only 1 or 2 articulated (double) buses are allowed into the roundabout at a time”. A rule like that might be required if you have a lot of articulated buses. The risk of this happening depends on how many ways you can enter a roundabout no a bus like that, how long the buses are, how frequently they run and how big the roundabout is.
It’s a deadlock situation and can arise without any screw ups. Imagine the buses being 5x as long and all reach the intersection at the same time as an example. All have space to enter the roundabout but they’ll reach the same situation as in the picture.
To fix this people uses signals and can be done by having the buses follow “Only 1 or 2 articulated (double) buses are allowed into the roundabout at a time”. A rule like that might be required if you have a lot of articulated buses. The risk of this happening depends on how many ways you can enter a roundabout no a bus like that, how long the buses are, how frequently they run and how big the roundabout is.