How to make a car drive in a circle

Hello, i am working on a school project, my goal is to make a self driving buss to drive around in a track that looks like this, see the shape under this sentence

My problem is to make the buss turn exactly 90 degrees. Right now I am using collision boxes and timelines in blueprint, but the bus just keep on turning to much or to little and the turn looks unnatural. Thanks in advance i am really looking forward to all your help.

Try using the teleport function. It allows you to ease in and out movement and it lets you set how long the turn will take.

If there is no AI involved and the bus is always making the same defined path, you can use a create a spline path in the level, then move the bus along the spline via a timeline.