Single Photo Series: Light Trail

Hi. My new post and experimental project. Here I used my long lens to shoot the photo.It takes from balcony at my mother's house. Actually this photo accidentally taken because of some reason that will show later in next post. However reason it is, this is my first time I think, I able to take a light trail photo. And i think it is a small step and success.
Enough my rambling, here is my gear

Canon 60D
Lenses Tamron 70-300mm
Tripod
ISO 125
F stop F/5.6
aperture 4
exposure time 20sec
no flash fired