It all depends on the amount of traffic and time of day. Certainly, riding there at night with no lights is simply dumb. At times of low traffic it is probably fine.
Here is what I don't like about that photo. The cyclist is riding too close to the edge of the road. No matter
where he rides, there is not enough room for two vehicles to pass
in the same direction at the same time. I would move to the left at least a foot. Not enough to be a dick but just enough to make it clear to motorists in the slow lane that they will have to slow down and yield.
By moving
towards traffic, you make yourself more visible. A motorist will recognize that there is NOT enough room sooner and will have more time to make an adjustment as they approach.
When you ride the edge, motorists
think they have room and don't slow down when they see you. Once they have gotten closer, they have less time to react. One of two things happen.
1. The motorists cuts into the left lane and risks an incident with another car. This will often lead to horns blowing from a second motorist who gets cut off.
2. The motorists hold their breathe and hopes to make the pass without incident. This results in the cyclist getting buzzed.