In this Instructable I will show you how to create these photos and other tricks using the same method.
HOW IT WORKS:
These photos are taken using long exposure settings on cameras. The car body doesn't show up in the photo as the road is exposed for a longer time, though the car lights show up as they are lights and will therefore be brighter than the lengthy exposed road.
Step 1: Items/Tools needed
1) A camera that has adjustable exposure settings. Usually 15-20 seconds is long enough. I find that digital SLRs work the best, though other cameras can be used.
2) A tripod or solid placement . This is to ensure the photo isn't blured by movement. This is esential as the long exposure will mean that any movement of the camera during the 15 or so seconds, will result in the image being blured.
You will also need a busy road that isn't well lit by street lights if possible.
To create the second type of photo in this Instructable (writing in the air, outlining people and objects) you will need a torch or LED light of some sort, preferably one that is not too bright, but is largely focuses the light straight forward instead of dispersing outwards.
Step 2: Firstly: Find the best location for tripod
Find a road that is busy at night, but isn't over lit by street lamps and surrounding buildings. Try to ensure that your photo has a key feature in it, like a roundabout or impressive building or road structure.
The best results come from positions where the camera is positioned high up on a hill, bridge or building that looks down onto the location of the picture.