I was trying to find the traffic widget on Apple website and could not find it. Luckily, I was able to find similar widget created by Luke FranclI and modified it. If you live in Houston area and need to see Houston’s live traffic on you dashboard, you can download this widget. It will do auto refresh on Yosemite.
1. Open the file to extract it
2. Hold control and click on “Houston Traffic Map.wdgt”, and select “Open”
3. There will be a warning to install it, and click Ok to install it