There are 66 Speed Cameras scattered throughout the city. When you drive past one, a camera flash will fill your screen and your speed will be recorded. Every camera is on the main streets, so you should be able to earn this after you've spent enough time playing all the different events that will take you through said streets.
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This map is from the Autolog website. Originally posted by our dear friends at ps3trophies.org.
Track your progress by pressing to open the map. Hit and cycle through to Speed Cameras. Compare your map to the one above to see which ones you're missing. You can also view the interactive guide HEREto check off the ones you've already collected.