According to Bisco in our IRC Chat says its a great patch, the best one so far!
• New: Added more Hotel models to increase hotel variety.
• Traffic: Updated routing system to improve traffic. Routing system now understands more information about u-turns, required vehicle stops, and vehicle behavior on certain road types. This should make traffic smarter.
• Traffic: Commercial and industrial buildings stagger their work shifts to start throughout commute hours instead of at the top of the hour. This should reduce traffic.
• Traffic: Fixes one issue where a car won’t move causing traffic to back up behind it.
• Traffic: Vehicles can now make right turns on Red. This should improve some cases of traffic.
• Traffic: Trading polish that will improve regional traffic when one city has a lot of jobs and its neighboring city has a lot of workers.
Full patch notes can be found here: http://forum.ea.com/eaforum/posts/list/9492563.page