I've attached a picture I saw on England's Telegraph newspaper website.
In the photo, nice linear streaks protrude from the streetlights.
How is this effect achieved? I'd prefer a technique that takes place when shooting, but I'd appreciate any suggestion that also involves Photoshop.
Additionally, if I want to take a similar photo indoors (i.e. with more ambient light), is it the same process?
EQUIPMENT: I shoot with a Nikon D7000