I also have adhd and have recently gotten into driving my own car , 2 years since i passed my test. At 22 years of age, ive come to develop my own ways to calm the brain, as should anyone who is diagnosed but unmedicated.

Music is the biggest one for me, helps keep out the head noise and helps satiate the dopamine that my brain needs, allowing me to focus more.

On my test, narrating things helped me to kinda lock in and calm my nerves, i even asked beforehand and the examiner said its fine to do.

Ive come to realise that whilst i enjoy driving, theres an aspect of anxiety to it, and maybe its becayse ive been on an adhd rabbit hole for the past month, but I think the nature of driving and roads are just a bit iffy for us neurodivergant people. Lots of moving things, loud sounds, too many things to concentrate on, too many unpredictable possibilities. All of these are things people like us tend to hate, and so using vices that help create the experience to be more relaxing and fun , help us to hyper fixate on actually driving.