With AutoCAD 2014, the ARC command has a simple-but-needed improvement. By default in AutoCAD, arcs are created counter clockwise. With 2014 you can control the creation of arcs to be clockwise or counter clockwise by simply holding the CTRL button.
See below for a more detailed look:
Simply opening the Arc tool’s flyout, there isn’t any obvious, visible change.
The direction that arcs are created are controlled in the UNITS dialog box
Although the new ARC direction option is available in all of the various arc tools, the most practical and obvious uses of the new ARC direction option are found in the ARC options shown below.
In the picture below, the upper arc that is being created shows the default ARC direction. The lower arc shows the new ARC direction option by hold the CTRL button during the command
AutoCAD Tips 
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Wow it only took 30+ years to fix this. Now if they can only make it repeat the same type of arc more than once in a row. Doubt I’ll be alive by then.
Thanks! It’s a great tip… very useful.
Do you know how can I change the default drawing of an arc? I want to draw an arc Center, Start, End, everytime I type “arc” in the command line, and I cannot find how change this default behaviour.
All this work in command window only. These command with script gives larger side arc.