Modern Times Factory and Highway Locations
Here is my latest post about Charlie filming the factory scenes near downtown Los Angeles. My book Silent Traces shows nearly all of the locations, including the finale on the open highway.
http://silentlocations.wordpress.com/2012/01/26/chaplins-modern-los-an geles-times/
You can see the open highway at this section of my Silent Locations blog - scroll down a bit and you'll see the highway photo.
http://silentlocations.wordpress.com/author-dvdblu-ray-special-program s/