I live in a city that is very popular with tourists (I mention this because it might be relevant).
Yesterday I was driving along the street when I spotted a car driving directly towards me on the wrong side of the road.
At first I thought maybe they were turning/parking so I slowed down. They continued driving towards me until I had to stop the car in the middle of the street and beep the horn.The lady driving the car was elderly with an elderly man beside her.
She clearly got a real fright and swerved the car back onto the correct side of the road and drove off quickly.
I was quite shaken - I had my baby in the car and have only recently passed my test.
My husband thinks I should have taken her registration and reported her to the police for dangerous driving but to be honest I was just glad there was no accident!
Was it irresponsible of me to not report her? Perhaps she was a tourist in a rental car? 
He thinks she could have dementia/poor eyesight.