This is a composite image of 22 shots with exposures ranging from 1/60s to 20 seconds at f11 on a tripod with a 10 stop ND filter and without any filter. I had to change my ISO (from 800 to 50) according to the shutter speed and the use or not of the filter so that it would be consistent throughout the shots. I then layered them in Photoshop using masking to get the result i wanted : to show all the different state of traffic on a ringroad at peak time.
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