Indeed, while it does look like you have got the settings and general idea of it all spot on, I think the real problem is trying to do it in what is the wrong time of the year. By the time it does get properly dark and for headlights to be switched on, it'll be about 10 pm by then, a time when most people are at home and getting into bed.
I reckon you will do very well if you try it again in the Autumn, a time when it becomes dark in the rush hour period (6 pm) but evenings are still fairly warm and pleasant anyway.