My commute to the nearest railway station on weekdays is 4,6 km. Totally nothing. (in weekends it's 15km)
But, I'm wearing a helmet for 'safety', even there is no really dangerous traffic.

I actually am the only person wearing a helmet when I'm at the bike parking at the railway station.
Apparently, other bikers think it's ridiculous here to wear it.

I use lights and reflecting stuff when it gets darker of course.